### Preflight Checklist - [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet - [x] This is a single bug report (please file separate reports for different bugs) - [ ] I am using the latest version of Claude Code ### What's Wrong? Claude worked fine until ~1 week ago. After leaving the computer unused for a week, Claude stopped responding on launch. I restarted, uninstalled, and tri

Windows 10: Stuck MSIX packages (0x80073CFA) block new installation (0x80073CFF) after interrupted auto-update

Resolved 💬 3 comments Opened Jun 12, 2026 by multimedomer Closed Jun 16, 2026

Preflight Checklist

[x] I have searched existing issues and this hasn't been reported yet
[x] This is a single bug report (please file separate reports for different bugs)
[ ] I am using the latest version of Claude Code

What's Wrong?

Claude worked fine until ~1 week ago. After leaving the computer unused for a week, Claude stopped responding on launch. I restarted, uninstalled, and tried to reinstall — but the installer fails every time.
The root cause appears to be a failed auto-update that left two corrupted MSIX packages stuck on the system. The installer cannot remove them (0x80073CFA) and cannot install the new version on top of them (0x80073CFF). All manual removal attempts fail with Access Denied due to corporate domain restrictions.

What Should Happen?

The installer should either successfully remove the old/corrupted MSIX packages before installing the new version, or gracefully handle the case where removal fails — for example by forcing an overwrite or providing a cleanup tool for stuck packages.

Error Messages/Logs

MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CFF

WARNING: Remove failed for Claude_1.9659.4.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
WARNING: Remove failed for Claude_1.8089.1.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
WARNING: failed to remove conflicting service: could not open CoworkVMService: Access is denied.

LOGS

2026/06/12 16:36:04.494419 Log file: C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log
2026/06/12 16:36:04.556954 === Claude Setup 5095e7dddcba4ca974d351ee397e17d204814f07 started ===
2026/06/12 16:36:04.556954 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/06/12 16:36:04.557493 Windows edition: CoreSingleLanguage
2026/06/12 16:36:04.558044 WARNING: CoworkVMService already exists (potential conflict)
2026/06/12 16:36:04.558044 Windows version: 10.0.26200
2026/06/12 16:36:04.558044 Native arch: x64
2026/06/12 16:36:04.558044 Elevation type: Limited
2026/06/12 16:36:04.558612 Is elevated: false
2026/06/12 16:36:04.558612 Sideloading enabled: true
2026/06/12 16:36:04.558612 S Mode: false
2026/06/12 16:36:04.558612 Conflicting service: true
2026/06/12 16:36:04.558612 Running in non-elevated context
2026/06/12 16:36:04.558612 User can elevate — installing MSIX directly
2026/06/12 16:36:04.582850 Splash: 400x300, 8 frame(s), animated=true
2026/06/12 16:36:04.583477 System DPI: 96 (scale: 100%)
2026/06/12 16:36:04.624665 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/06/12 16:36:04.625189 Downloading MSIX to C:\Users\etica\AppData\Local\Temp\Claude-3403321394.msix
2026/06/12 16:36:04.637321 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/06/12 16:36:04.876275 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.12603.1/Claude-3df4fd263723119bc45f0af2d784afd5055e2ba9.msix"): winapi error #12180
2026/06/12 16:36:08.778390 Download progress: 10% (23084880 / 230697820 bytes)
2026/06/12 16:36:12.492598 Download progress: 20% (46153376 / 230697820 bytes)
2026/06/12 16:36:16.341538 Download progress: 30% (69221872 / 230697820 bytes)
2026/06/12 16:36:21.126877 Download progress: 40% (92290368 / 230697820 bytes)
2026/06/12 16:36:25.022553 Download progress: 50% (115375248 / 230697820 bytes)
2026/06/12 16:36:29.128887 Download progress: 60% (138427360 / 230697820 bytes)
2026/06/12 16:36:32.844581 Download progress: 70% (161495856 / 230697820 bytes)
2026/06/12 16:36:36.633581 Download progress: 80% (184580736 / 230697820 bytes)
2026/06/12 16:36:40.476210 Download progress: 90% (207632848 / 230697820 bytes)
2026/06/12 16:36:44.122894 Download progress: 100% (230697820 / 230697820 bytes)
2026/06/12 16:36:44.125337 Download complete: 230697820 bytes, SHA256: 01777d6e38533e2b7a7454d21a65b23fb1264d8f5957613c6f44d5bc34b42f37
2026/06/12 16:36:44.126604 Download complete
2026/06/12 16:36:44.145752 Self-elevating: C:\Users\etica\Downloads\Claude Setup.exe --elevated --msix-path "C:\Users\etica\AppData\Local\Temp\Claude-3403321394.msix" --log-path "C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log"
2026/06/12 16:36:45.905844 Waiting for elevated process to complete...
2026/06/12 16:36:45.927693 Log file: C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log
2026/06/12 16:36:45.941647 === Claude Setup 5095e7dddcba4ca974d351ee397e17d204814f07 started ===
2026/06/12 16:36:45.942179 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/06/12 16:36:45.942179 Windows edition: CoreSingleLanguage
2026/06/12 16:36:45.942699 WARNING: CoworkVMService already exists (potential conflict)
2026/06/12 16:36:45.942699 Windows version: 10.0.26200
2026/06/12 16:36:45.942699 Native arch: x64
2026/06/12 16:36:45.942699 Elevation type: Full
2026/06/12 16:36:45.942699 Is elevated: true
2026/06/12 16:36:45.942699 Sideloading enabled: true
2026/06/12 16:36:45.942699 S Mode: false
2026/06/12 16:36:45.942699 Conflicting service: true
2026/06/12 16:36:45.942699 Running in elevated context
2026/06/12 16:36:45.942699 Installing MSIX from C:\Users\etica\AppData\Local\Temp\Claude-3403321394.msix (all-users: false)
2026/06/12 16:36:45.967839 Splash: 400x300, 8 frame(s), animated=true
2026/06/12 16:36:45.967839 System DPI: 96 (scale: 100%)
2026/06/12 16:36:46.000060 Verifying Authenticode signature on C:\Users\etica\AppData\Local\Temp\Claude-3403321394.msix
2026/06/12 16:36:46.692888 WinVerifyTrust: MSIX signature is valid
2026/06/12 16:36:46.993256 Signature verified: MSIX signer matches bootstrapper
2026/06/12 16:36:46.993256 Squirrel process prefix: c:\users\etica\appdata\local\anthropicclaude\
2026/06/12 16:36:46.993256 Checking for running Squirrel Claude processes...
2026/06/12 16:36:46.998433 No Squirrel Claude processes found
2026/06/12 16:36:46.999222 Removing conflicting CoworkVMService...
2026/06/12 16:36:46.999222 WARNING: failed to remove conflicting service: could not open CoworkVMService: Access is denied.
2026/06/12 16:36:46.999222 Checking for existing Claude MSIX packages...
2026/06/12 16:36:47.020875 Removing: Claude_1.9659.4.0_x64__pzs8sxrjxfjjc
2026/06/12 16:36:47.275291 WARNING: Remove failed for Claude_1.9659.4.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
2026/06/12 16:36:47.287480 Removing (user): Claude_1.8089.1.0_x64__pzs8sxrjxfjjc
2026/06/12 16:36:47.291583 WARNING: Remove failed for Claude_1.8089.1.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
2026/06/12 16:36:47.291583 Removing (user): Claude_1.9659.4.0_x64__pzs8sxrjxfjjc
2026/06/12 16:36:47.294552 WARNING: Remove failed for Claude_1.9659.4.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
2026/06/12 16:36:47.294552 Installing MSIX: C:\Users\etica\AppData\Local\Temp\Claude-3403321394.msix
2026/06/12 16:36:47.295700 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/06/12 16:36:47.295700 Standard install (not split-account), using AddPackage
2026/06/12 16:36:47.295700 Installing via AddPackage (current-user)...
2026/06/12 16:36:48.059875 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CFF
2026/06/12 16:36:48.060541 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CFF

Please share this log with us.
2026/06/12 16:36:54.800930 Elevated process exited with code 1
2026/06/12 16:36:54.800930 Elevation failed: elevated installer exited with code 1
2026/06/12 16:36:54.800930 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/06/12 16:41:16.912693 Log file: C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log
2026/06/12 16:41:16.993131 === Claude Setup 3df4fd263723119bc45f0af2d784afd5055e2ba9 started ===
2026/06/12 16:41:16.993131 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/06/12 16:41:16.993655 Windows edition: CoreSingleLanguage
2026/06/12 16:41:16.994180 WARNING: CoworkVMService already exists (potential conflict)
2026/06/12 16:41:16.994180 Windows version: 10.0.26200
2026/06/12 16:41:16.994180 Native arch: x64
2026/06/12 16:41:16.994180 Elevation type: Limited
2026/06/12 16:41:16.994180 Is elevated: false
2026/06/12 16:41:16.994180 Sideloading enabled: true
2026/06/12 16:41:16.994180 S Mode: false
2026/06/12 16:41:16.994180 Conflicting service: true
2026/06/12 16:41:16.994180 Running in non-elevated context
2026/06/12 16:41:16.994180 User can elevate — installing MSIX directly
2026/06/12 16:41:17.023765 Splash: 400x300, 8 frame(s), animated=true
2026/06/12 16:41:17.024287 System DPI: 96 (scale: 100%)
2026/06/12 16:41:17.067156 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/06/12 16:41:17.067726 Downloading MSIX to C:\Users\etica\AppData\Local\Temp\Claude-2064695736.msix
2026/06/12 16:41:17.082209 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/06/12 16:41:17.313942 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.12603.1/Claude-3df4fd263723119bc45f0af2d784afd5055e2ba9.msix"): winapi error #12180
2026/06/12 16:41:21.422904 Download progress: 10% (23101264 / 230697820 bytes)
2026/06/12 16:41:25.399028 Download progress: 20% (46153376 / 230697820 bytes)
2026/06/12 16:41:29.194911 Download progress: 30% (69221872 / 230697820 bytes)
2026/06/12 16:41:33.181245 Download progress: 40% (92290368 / 230697820 bytes)
2026/06/12 16:41:37.135335 Download progress: 50% (115358864 / 230697820 bytes)
2026/06/12 16:41:40.803524 Download progress: 60% (138427360 / 230697820 bytes)
2026/06/12 16:41:44.619786 Download progress: 70% (161495856 / 230697820 bytes)
2026/06/12 16:41:51.831681 Download progress: 80% (184564352 / 230697820 bytes)
2026/06/12 16:41:55.783535 Download progress: 90% (207632848 / 230697820 bytes)
2026/06/12 16:41:59.534615 Download progress: 100% (230697820 / 230697820 bytes)
2026/06/12 16:41:59.535710 Download complete: 230697820 bytes, SHA256: 01777d6e38533e2b7a7454d21a65b23fb1264d8f5957613c6f44d5bc34b42f37
2026/06/12 16:41:59.535710 Download complete
2026/06/12 16:41:59.553537 Self-elevating: C:\Users\etica\AppData\Local\Temp\scoped_dir540_884101713\Claude Setup (2).exe --elevated --msix-path "C:\Users\etica\AppData\Local\Temp\Claude-2064695736.msix" --log-path "C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log"
2026/06/12 16:43:00.327703 Waiting for elevated process to complete...
2026/06/12 16:43:00.339224 Log file: C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log
2026/06/12 16:43:00.367469 === Claude Setup 3df4fd263723119bc45f0af2d784afd5055e2ba9 started ===
2026/06/12 16:43:00.367469 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/06/12 16:43:00.367469 Windows edition: CoreSingleLanguage
2026/06/12 16:43:00.368472 WARNING: CoworkVMService already exists (potential conflict)
2026/06/12 16:43:00.368472 Windows version: 10.0.26200
2026/06/12 16:43:00.368472 Native arch: x64
2026/06/12 16:43:00.368472 Elevation type: Full
2026/06/12 16:43:00.368472 Is elevated: true
2026/06/12 16:43:00.368472 Sideloading enabled: true
2026/06/12 16:43:00.368472 S Mode: false
2026/06/12 16:43:00.368472 Conflicting service: true
2026/06/12 16:43:00.368472 Running in elevated context
2026/06/12 16:43:00.368472 Installing MSIX from C:\Users\etica\AppData\Local\Temp\Claude-2064695736.msix (all-users: false)
2026/06/12 16:43:00.394065 Splash: 400x300, 8 frame(s), animated=true
2026/06/12 16:43:00.394065 System DPI: 96 (scale: 100%)
2026/06/12 16:43:00.430614 Verifying Authenticode signature on C:\Users\etica\AppData\Local\Temp\Claude-2064695736.msix
2026/06/12 16:43:01.119473 WinVerifyTrust: MSIX signature is valid
2026/06/12 16:43:01.443737 Signature verified: MSIX signer matches bootstrapper
2026/06/12 16:43:01.446167 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/06/12 16:43:01.446167 Squirrel process prefix: c:\users\etica\appdata\local\anthropicclaude\
2026/06/12 16:43:01.446167 Checking for running Squirrel Claude processes...
2026/06/12 16:43:01.452431 No Squirrel Claude processes found
2026/06/12 16:43:01.452431 Removing conflicting CoworkVMService...
2026/06/12 16:43:01.452431 WARNING: failed to remove conflicting service: could not open CoworkVMService: Access is denied.
2026/06/12 16:43:01.452431 Checking for existing Claude MSIX packages...
2026/06/12 16:43:01.477692 Removing: Claude_1.8089.1.0_x64__pzs8sxrjxfjjc
2026/06/12 16:43:01.488185 WARNING: Remove failed for Claude_1.8089.1.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
2026/06/12 16:43:01.488185 Removing: Claude_1.9659.4.0_x64__pzs8sxrjxfjjc
2026/06/12 16:43:01.492028 WARNING: Remove failed for Claude_1.9659.4.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
2026/06/12 16:43:01.502914 Removing (user): Claude_1.9659.4.0_x64__pzs8sxrjxfjjc
2026/06/12 16:43:01.506271 WARNING: Remove failed for Claude_1.9659.4.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
2026/06/12 16:43:01.506271 Installing MSIX: C:\Users\etica\AppData\Local\Temp\Claude-2064695736.msix
2026/06/12 16:43:01.507269 Standard install (not split-account), using AddPackage
2026/06/12 16:43:01.507269 Installing via AddPackage (current-user)...
2026/06/12 16:43:02.028351 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CFF
2026/06/12 16:43:02.028351 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CFF

Please share this log with us.
2026/06/12 16:45:54.527296 Elevated process exited with code 1
2026/06/12 16:45:54.527296 Elevation failed: elevated installer exited with code 1
2026/06/12 16:45:54.527296 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/06/12 16:48:41.021338 Log file: C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log
2026/06/12 16:48:41.099194 === Claude Setup 3df4fd263723119bc45f0af2d784afd5055e2ba9 started ===
2026/06/12 16:48:41.099194 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/06/12 16:48:41.099194 Windows edition: CoreSingleLanguage
2026/06/12 16:48:41.099746 Windows version: 10.0.26200
2026/06/12 16:48:41.099746 Native arch: x64
2026/06/12 16:48:41.099746 Elevation type: Limited
2026/06/12 16:48:41.099746 Is elevated: false
2026/06/12 16:48:41.099746 Sideloading enabled: true
2026/06/12 16:48:41.099746 S Mode: false
2026/06/12 16:48:41.099746 Conflicting service: false
2026/06/12 16:48:41.099746 Running in non-elevated context
2026/06/12 16:48:41.099746 User can elevate — installing MSIX directly
2026/06/12 16:48:41.124391 Splash: 400x300, 8 frame(s), animated=true
2026/06/12 16:48:41.124391 System DPI: 96 (scale: 100%)
2026/06/12 16:48:41.158159 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/06/12 16:48:41.158675 Downloading MSIX to C:\Users\etica\AppData\Local\Temp\Claude-4175078694.msix
2026/06/12 16:48:41.170090 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/06/12 16:48:41.394548 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.12603.1/Claude-3df4fd263723119bc45f0af2d784afd5055e2ba9.msix"): winapi error #12180
2026/06/12 16:48:46.174996 Download progress: 10% (23101264 / 230697820 bytes)
2026/06/12 16:48:50.443777 Download progress: 20% (46153376 / 230697820 bytes)
2026/06/12 16:48:54.227289 Download progress: 30% (69221872 / 230697820 bytes)
2026/06/12 16:48:57.958432 Download progress: 40% (92290368 / 230697820 bytes)
2026/06/12 16:49:01.528026 Download progress: 50% (115358864 / 230697820 bytes)
2026/06/12 16:49:05.325297 Download progress: 60% (138427360 / 230697820 bytes)
2026/06/12 16:49:09.237490 Download progress: 70% (161495856 / 230697820 bytes)
2026/06/12 16:49:12.867221 Download progress: 80% (184564352 / 230697820 bytes)
2026/06/12 16:49:17.114222 Download progress: 90% (207632848 / 230697820 bytes)
2026/06/12 16:49:20.911235 Download progress: 100% (230697820 / 230697820 bytes)
2026/06/12 16:49:20.914585 Download complete: 230697820 bytes, SHA256: 01777d6e38533e2b7a7454d21a65b23fb1264d8f5957613c6f44d5bc34b42f37
2026/06/12 16:49:20.915374 Download complete
2026/06/12 16:49:20.921572 Self-elevating: C:\Users\etica\Downloads\Claude Setup (2).exe --elevated --msix-path "C:\Users\etica\AppData\Local\Temp\Claude-4175078694.msix" --log-path "C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log"
2026/06/12 16:49:22.315514 Waiting for elevated process to complete...
2026/06/12 16:49:22.330967 Log file: C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log
2026/06/12 16:49:22.356225 === Claude Setup 3df4fd263723119bc45f0af2d784afd5055e2ba9 started ===
2026/06/12 16:49:22.356225 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/06/12 16:49:22.356858 Windows edition: CoreSingleLanguage
2026/06/12 16:49:22.357544 Windows version: 10.0.26200
2026/06/12 16:49:22.357544 Native arch: x64
2026/06/12 16:49:22.357544 Elevation type: Full
2026/06/12 16:49:22.357544 Is elevated: true
2026/06/12 16:49:22.357544 Sideloading enabled: true
2026/06/12 16:49:22.357544 S Mode: false
2026/06/12 16:49:22.357544 Conflicting service: false
2026/06/12 16:49:22.357544 Running in elevated context
2026/06/12 16:49:22.358072 Installing MSIX from C:\Users\etica\AppData\Local\Temp\Claude-4175078694.msix (all-users: false)
2026/06/12 16:49:22.385179 Splash: 400x300, 8 frame(s), animated=true
2026/06/12 16:49:22.385179 System DPI: 96 (scale: 100%)
2026/06/12 16:49:22.425954 Verifying Authenticode signature on C:\Users\etica\AppData\Local\Temp\Claude-4175078694.msix
2026/06/12 16:49:23.151010 WinVerifyTrust: MSIX signature is valid
2026/06/12 16:49:23.581649 Signature verified: MSIX signer matches bootstrapper
2026/06/12 16:49:23.583505 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/06/12 16:49:23.583505 Squirrel process prefix: c:\users\etica\appdata\local\anthropicclaude\
2026/06/12 16:49:23.583505 Checking for running Squirrel Claude processes...
2026/06/12 16:49:23.590537 No Squirrel Claude processes found
2026/06/12 16:49:23.590537 Checking for existing Claude MSIX packages...
2026/06/12 16:49:23.617220 Removing: Claude_1.9659.4.0_x64__pzs8sxrjxfjjc
2026/06/12 16:49:23.630844 WARNING: Remove failed for Claude_1.9659.4.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
2026/06/12 16:49:23.663994 Installing MSIX: C:\Users\etica\AppData\Local\Temp\Claude-4175078694.msix
2026/06/12 16:49:23.663994 Standard install (not split-account), using AddPackage
2026/06/12 16:49:23.663994 Installing via AddPackage (current-user)...
2026/06/12 16:49:24.430042 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CFF
2026/06/12 16:49:24.430549 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CFF

Please share this log with us.
2026/06/12 16:49:46.618131 Elevated process exited with code 1
2026/06/12 16:49:46.618131 Elevation failed: elevated installer exited with code 1
2026/06/12 16:49:46.618131 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/06/12 16:52:44.578305 Log file: C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log
2026/06/12 16:52:44.838750 === Claude Setup 3df4fd263723119bc45f0af2d784afd5055e2ba9 started ===
2026/06/12 16:52:44.838750 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/06/12 16:52:44.839128 Windows edition: CoreSingleLanguage
2026/06/12 16:52:44.840894 Windows version: 10.0.26200
2026/06/12 16:52:44.840894 Native arch: x64
2026/06/12 16:52:44.840894 Elevation type: Limited
2026/06/12 16:52:44.840894 Is elevated: false
2026/06/12 16:52:44.840894 Sideloading enabled: true
2026/06/12 16:52:44.840894 S Mode: false
2026/06/12 16:52:44.840894 Conflicting service: false
2026/06/12 16:52:44.840894 Running in non-elevated context
2026/06/12 16:52:44.840894 User can elevate — installing MSIX directly
2026/06/12 16:52:44.982212 Splash: 400x300, 8 frame(s), animated=true
2026/06/12 16:52:44.983893 System DPI: 96 (scale: 100%)
2026/06/12 16:52:45.110098 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/06/12 16:52:45.111240 Downloading MSIX to C:\Users\etica\AppData\Local\Temp\Claude-1744160317.msix
2026/06/12 16:52:45.140360 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/06/12 16:52:45.469771 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.12603.1/Claude-3df4fd263723119bc45f0af2d784afd5055e2ba9.msix"): winapi error #12180
2026/06/12 16:52:49.482801 Download progress: 10% (23084880 / 230697820 bytes)
2026/06/12 16:52:53.631789 Download progress: 20% (46153376 / 230697820 bytes)
2026/06/12 16:52:57.791915 Download progress: 30% (69221872 / 230697820 bytes)
2026/06/12 16:53:01.753565 Download progress: 40% (92290368 / 230697820 bytes)
2026/06/12 16:53:05.434771 Download progress: 50% (115358864 / 230697820 bytes)
2026/06/12 16:53:09.280757 Download progress: 60% (138427360 / 230697820 bytes)
2026/06/12 16:53:13.050671 Download progress: 70% (161495872 / 230697820 bytes)
2026/06/12 16:53:16.901517 Download progress: 80% (184580736 / 230697820 bytes)
2026/06/12 16:53:21.210534 Download progress: 90% (207632848 / 230697820 bytes)
2026/06/12 16:53:24.919548 Download progress: 100% (230697820 / 230697820 bytes)
2026/06/12 16:53:24.921752 Download complete: 230697820 bytes, SHA256: 01777d6e38533e2b7a7454d21a65b23fb1264d8f5957613c6f44d5bc34b42f37
2026/06/12 16:53:24.922295 Download complete
2026/06/12 16:53:24.928278 Self-elevating: C:\Users\etica\Downloads\Claude Setup (2).exe --elevated --msix-path "C:\Users\etica\AppData\Local\Temp\Claude-1744160317.msix" --log-path "C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log"
2026/06/12 16:53:26.989990 Waiting for elevated process to complete...
2026/06/12 16:53:27.015040 Log file: C:\Users\etica\AppData\Local\Temp\ClaudeSetup.log
2026/06/12 16:53:27.035829 === Claude Setup 3df4fd263723119bc45f0af2d784afd5055e2ba9 started ===
2026/06/12 16:53:27.036444 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/06/12 16:53:27.036444 Windows edition: CoreSingleLanguage
2026/06/12 16:53:27.037044 Windows version: 10.0.26200
2026/06/12 16:53:27.037044 Native arch: x64
2026/06/12 16:53:27.037044 Elevation type: Full
2026/06/12 16:53:27.037044 Is elevated: true
2026/06/12 16:53:27.037044 Sideloading enabled: true
2026/06/12 16:53:27.037044 S Mode: false
2026/06/12 16:53:27.037044 Conflicting service: false
2026/06/12 16:53:27.037044 Running in elevated context
2026/06/12 16:53:27.037044 Installing MSIX from C:\Users\etica\AppData\Local\Temp\Claude-1744160317.msix (all-users: false)
2026/06/12 16:53:27.060074 Splash: 400x300, 8 frame(s), animated=true
2026/06/12 16:53:27.060074 System DPI: 96 (scale: 100%)
2026/06/12 16:53:27.092058 Verifying Authenticode signature on C:\Users\etica\AppData\Local\Temp\Claude-1744160317.msix
2026/06/12 16:53:27.854648 WinVerifyTrust: MSIX signature is valid
2026/06/12 16:53:28.176405 Signature verified: MSIX signer matches bootstrapper
2026/06/12 16:53:28.177826 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/06/12 16:53:28.177826 Squirrel process prefix: c:\users\etica\appdata\local\anthropicclaude\
2026/06/12 16:53:28.177826 Checking for running Squirrel Claude processes...
2026/06/12 16:53:28.183100 No Squirrel Claude processes found
2026/06/12 16:53:28.183659 Checking for existing Claude MSIX packages...
2026/06/12 16:53:28.209421 Removing: Claude_1.9659.4.0_x64__pzs8sxrjxfjjc
2026/06/12 16:53:28.233394 WARNING: Remove failed for Claude_1.9659.4.0_x64__pzs8sxrjxfjjc: RemovePackage failed with HRESULT 0x80073CFA
2026/06/12 16:53:28.251289 Installing MSIX: C:\Users\etica\AppData\Local\Temp\Claude-1744160317.msix
2026/06/12 16:53:28.251765 Standard install (not split-account), using AddPackage
2026/06/12 16:53:28.251765 Installing via AddPackage (current-user)...
2026/06/12 16:53:29.005325 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CFF
2026/06/12 16:53:29.006664 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CFF

Please share this log with us.
2026/06/12 16:53:36.196394 Elevated process exited with code 1
2026/06/12 16:53:36.196394 Elevation failed: elevated installer exited with code 1
2026/06/12 16:53:36.196394 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.

Steps to Reproduce

Have Claude desktop app installed and working on Windows 10 (corporate Azure AD account)
Leave the computer unused for ~1 week (Claude likely attempts auto-update in background)
Try to launch Claude — app does not respond
Restart the computer — same issue
Uninstall Claude via Windows Settings → Apps
Download and run the latest Claude Setup installer
Installer fails with 0x80073CFF

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

N/A — This issue is about Claude Desktop app, not Claude Code.

Platform

Other

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

This is a Claude Desktop installation issue, not Claude Code. The app was working fine until ~1 week ago. A failed auto-update left corrupted MSIX packages stuck on the system that cannot be removed due to corporate domain (Azure AD) restrictions. Log file attached.

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