[BUG] Failed installing claude code desktop app

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)
• [x] I am using the latest version of Claude Code

What's Wrong?

I tried launching the app, got a Another program is currently using this file. consistently so I rebooted, same error. Then uninstalled and am trying to reinstall but keep running into this:
\---------------------------
Claude Setup
\---------------------------
Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.

The log file will be opened in Explorer.

What Should Happen?

The app should install.

Error Messages/Logs

2026/05/02 21:48:11.970883 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:48:11.971413 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:48:11.971413 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:48:11.971937 Windows edition: Core
2026/05/02 21:48:11.972454 Windows version: 10.0.26200
2026/05/02 21:48:11.972454 Native arch: x64
2026/05/02 21:48:11.972454 Elevation type: Limited
2026/05/02 21:48:11.972454 Is elevated: false
2026/05/02 21:48:11.972454 Sideloading enabled: true
2026/05/02 21:48:11.972454 S Mode: false
2026/05/02 21:48:11.972454 Conflicting service: false
2026/05/02 21:48:11.972454 Running in non-elevated context
2026/05/02 21:48:11.972454 User can elevate — installing MSIX directly
2026/05/02 21:48:11.988195 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:48:11.988195 System DPI: 96 (scale: 100%)
2026/05/02 21:48:12.024812 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/02 21:48:12.025332 Downloading MSIX to C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix
2026/05/02 21:48:12.034773 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/05/02 21:48:12.051052 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:48:12.051052 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:48:12.051052 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:48:12.052059 Windows edition: Core
2026/05/02 21:48:12.052059 Windows version: 10.0.26200
2026/05/02 21:48:12.052059 Native arch: x64
2026/05/02 21:48:12.052059 Elevation type: Limited
2026/05/02 21:48:12.052059 Is elevated: false
2026/05/02 21:48:12.052059 Sideloading enabled: true
2026/05/02 21:48:12.052059 S Mode: false
2026/05/02 21:48:12.052059 Conflicting service: false
2026/05/02 21:48:12.052059 Running in non-elevated context
2026/05/02 21:48:12.052059 User can elevate — installing MSIX directly
2026/05/02 21:48:12.066195 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:48:12.066195 System DPI: 96 (scale: 100%)
2026/05/02 21:48:12.095661 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/02 21:48:12.096176 Downloading MSIX to C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix
2026/05/02 21:48:12.104049 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/05/02 21:48:12.271505 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180
2026/05/02 21:48:12.287879 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180
2026/05/02 21:48:23.538405 Download progress: 10% (24248144 / 242355880 bytes)
2026/05/02 21:48:33.887337 Download progress: 10% (24248144 / 242355880 bytes)
2026/05/02 21:48:37.406692 Download progress: 20% (48496272 / 242355880 bytes)
2026/05/02 21:48:43.566445 Download progress: 20% (48496272 / 242355880 bytes)
2026/05/02 21:48:52.183596 Download progress: 30% (72711648 / 242355880 bytes)
2026/05/02 21:48:52.826855 Download progress: 30% (72711648 / 242355880 bytes)
2026/05/02 21:49:03.693667 Download progress: 40% (96943392 / 242355880 bytes)
2026/05/02 21:49:05.793341 Download progress: 40% (96943392 / 242355880 bytes)
2026/05/02 21:49:15.019094 Download progress: 50% (121191536 / 242355880 bytes)
2026/05/02 21:49:28.343902 Download progress: 60% (145423280 / 242355880 bytes)
2026/05/02 21:49:31.560210 Download progress: 50% (121191536 / 242355880 bytes)
2026/05/02 21:49:38.093988 Download progress: 70% (169655040 / 242355880 bytes)
2026/05/02 21:49:47.841135 Download progress: 80% (193886784 / 242355880 bytes)
2026/05/02 21:49:47.956036 Download progress: 60% (145423280 / 242355880 bytes)
2026/05/02 21:50:04.071376 Download progress: 90% (218134912 / 242355880 bytes)
2026/05/02 21:50:06.699147 Download progress: 70% (169655040 / 242355880 bytes)
2026/05/02 21:50:16.392198 Download progress: 100% (242355880 / 242355880 bytes)
2026/05/02 21:50:16.392733 Download complete: 242355880 bytes, SHA256: 4d38cdb4f097e9e562621f993d77f00286c498ee2b389eeb44d2f49a9f72d404
2026/05/02 21:50:16.393792 Download complete
2026/05/02 21:50:16.400142 Self-elevating: C:\Users\[redacted]\Downloads\Claude Setup(1).exe --elevated --msix-path "C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix" --log-path "C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log"
2026/05/02 21:50:16.608670 Waiting for elevated process to complete...
2026/05/02 21:50:16.618540 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:50:16.618540 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:50:16.618540 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:50:16.619070 Windows edition: Core
2026/05/02 21:50:16.619070 Windows version: 10.0.26200
2026/05/02 21:50:16.619070 Native arch: x64
2026/05/02 21:50:16.619070 Elevation type: Full
2026/05/02 21:50:16.619070 Is elevated: true
2026/05/02 21:50:16.619070 Sideloading enabled: true
2026/05/02 21:50:16.619070 S Mode: false
2026/05/02 21:50:16.619070 Conflicting service: false
2026/05/02 21:50:16.619070 Running in elevated context
2026/05/02 21:50:16.619590 Installing MSIX from C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix (all-users: false)
2026/05/02 21:50:16.634271 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:50:16.634271 System DPI: 96 (scale: 100%)
2026/05/02 21:50:16.661667 Verifying Authenticode signature on C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix
2026/05/02 21:50:17.050177 Download progress: 80% (193886784 / 242355880 bytes)
2026/05/02 21:50:17.312181 WinVerifyTrust: MSIX signature is valid
2026/05/02 21:50:17.616527 Signature verified: MSIX signer matches bootstrapper
2026/05/02 21:50:17.616527 Squirrel process prefix: c:\users\[redacted]\appdata\local\anthropicclaude\
2026/05/02 21:50:17.616527 Checking for running Squirrel Claude processes...
2026/05/02 21:50:17.625040 No Squirrel Claude processes found
2026/05/02 21:50:17.625040 Checking for existing Claude MSIX packages...
2026/05/02 21:50:17.642329 Installing MSIX: C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix
2026/05/02 21:50:17.643379 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/02 21:50:17.643379 Standard install (not split-account), using AddPackage
2026/05/02 21:50:17.643379 Installing via AddPackage (current-user)...
2026/05/02 21:50:25.508077 Download progress: 90% (218134912 / 242355880 bytes)
2026/05/02 21:50:29.656731 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/02 21:50:29.656731 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/05/02 21:50:31.724384 Download progress: 100% (242355880 / 242355880 bytes)
2026/05/02 21:50:31.724893 Download complete: 242355880 bytes, SHA256: 4d38cdb4f097e9e562621f993d77f00286c498ee2b389eeb44d2f49a9f72d404
2026/05/02 21:50:31.725931 Download complete
2026/05/02 21:50:31.732152 Self-elevating: C:\Users\[redacted]\Downloads\Claude Setup(1).exe --elevated --msix-path "C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix" --log-path "C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log"
2026/05/02 21:50:31.852517 Waiting for elevated process to complete...
2026/05/02 21:50:31.861583 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:50:31.861583 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:50:31.861583 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:50:31.862111 Windows edition: Core
2026/05/02 21:50:31.862680 Windows version: 10.0.26200
2026/05/02 21:50:31.862680 Native arch: x64
2026/05/02 21:50:31.862680 Elevation type: Full
2026/05/02 21:50:31.862680 Is elevated: true
2026/05/02 21:50:31.862680 Sideloading enabled: true
2026/05/02 21:50:31.862680 S Mode: false
2026/05/02 21:50:31.862680 Conflicting service: false
2026/05/02 21:50:31.862680 Running in elevated context
2026/05/02 21:50:31.862680 Installing MSIX from C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix (all-users: false)
2026/05/02 21:50:31.877241 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:50:31.877241 System DPI: 96 (scale: 100%)
2026/05/02 21:50:31.900756 Verifying Authenticode signature on C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix
2026/05/02 21:50:32.522658 WinVerifyTrust: MSIX signature is valid
2026/05/02 21:50:32.828512 Signature verified: MSIX signer matches bootstrapper
2026/05/02 21:50:32.828512 Squirrel process prefix: c:\users\[redacted]\appdata\local\anthropicclaude\
2026/05/02 21:50:32.828512 Checking for running Squirrel Claude processes...
2026/05/02 21:50:32.844244 No Squirrel Claude processes found
2026/05/02 21:50:32.844244 Checking for existing Claude MSIX packages...
2026/05/02 21:50:32.858378 Installing MSIX: C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix
2026/05/02 21:50:32.858901 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/02 21:50:32.859412 Standard install (not split-account), using AddPackage
2026/05/02 21:50:32.859412 Installing via AddPackage (current-user)...
2026/05/02 21:50:44.615006 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/02 21:50:44.615006 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/05/02 21:51:07.729954 Elevated process exited with code 1
2026/05/02 21:51:07.729954 Elevation failed: elevated installer exited with code 1
2026/05/02 21:51:07.729954 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/05/02 21:52:11.747490 Elevated process exited with code 1
2026/05/02 21:52:11.747490 Elevation failed: elevated installer exited with code 1
2026/05/02 21:52:11.748489 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/05/02 21:52:21.660958 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:52:21.660958 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:52:21.660958 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:52:21.660958 Windows edition: Core
2026/05/02 21:52:21.661483 Windows version: 10.0.26200
2026/05/02 21:52:21.661483 Native arch: x64
2026/05/02 21:52:21.661483 Elevation type: Full
2026/05/02 21:52:21.661483 Is elevated: true
2026/05/02 21:52:21.661483 Sideloading enabled: true
2026/05/02 21:52:21.661483 S Mode: false
2026/05/02 21:52:21.661483 Conflicting service: false
2026/05/02 21:52:21.661483 Running in non-elevated context
2026/05/02 21:52:21.661483 User can elevate — installing MSIX directly
2026/05/02 21:52:21.676569 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:52:21.676569 System DPI: 96 (scale: 100%)
2026/05/02 21:52:21.706969 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/02 21:52:21.707487 Downloading MSIX to C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix
2026/05/02 21:52:21.716453 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/05/02 21:52:21.999327 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180
2026/05/02 21:52:29.850644 Download progress: 10% (24248144 / 242355880 bytes)
2026/05/02 21:52:37.611217 Download progress: 20% (48496272 / 242355880 bytes)
2026/05/02 21:52:44.659246 Download progress: 30% (72711648 / 242355880 bytes)
2026/05/02 21:52:51.093151 Download progress: 40% (96943392 / 242355880 bytes)
2026/05/02 21:52:57.237138 Download progress: 50% (121191536 / 242355880 bytes)
2026/05/02 21:53:02.901137 Download progress: 60% (145423280 / 242355880 bytes)
2026/05/02 21:53:09.059805 Download progress: 70% (169654464 / 242355880 bytes)
2026/05/02 21:53:15.977579 Download progress: 80% (193886784 / 242355880 bytes)
2026/05/02 21:53:22.181621 Download progress: 90% (218134912 / 242355880 bytes)
2026/05/02 21:53:28.661506 Download progress: 100% (242355880 / 242355880 bytes)
2026/05/02 21:53:28.662125 Download complete: 242355880 bytes, SHA256: 4d38cdb4f097e9e562621f993d77f00286c498ee2b389eeb44d2f49a9f72d404
2026/05/02 21:53:28.662660 Download complete
2026/05/02 21:53:28.675784 Self-elevating: C:\Users\[redacted]\Downloads\Claude Setup(1).exe --elevated --msix-path "C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix" --log-path "C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log"
2026/05/02 21:53:28.721254 Waiting for elevated process to complete...
2026/05/02 21:53:28.729599 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:53:28.730118 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:53:28.730118 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:53:28.730118 Windows edition: Core
2026/05/02 21:53:28.730649 Windows version: 10.0.26200
2026/05/02 21:53:28.730649 Native arch: x64
2026/05/02 21:53:28.730649 Elevation type: Full
2026/05/02 21:53:28.730649 Is elevated: true
2026/05/02 21:53:28.730649 Sideloading enabled: true
2026/05/02 21:53:28.730649 S Mode: false
2026/05/02 21:53:28.730649 Conflicting service: false
2026/05/02 21:53:28.730649 Running in elevated context
2026/05/02 21:53:28.730649 Installing MSIX from C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix (all-users: false)
2026/05/02 21:53:28.745917 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:53:28.745917 System DPI: 96 (scale: 100%)
2026/05/02 21:53:28.770239 Verifying Authenticode signature on C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix
2026/05/02 21:53:29.402827 WinVerifyTrust: MSIX signature is valid
2026/05/02 21:53:29.695098 Signature verified: MSIX signer matches bootstrapper
2026/05/02 21:53:29.695098 Squirrel process prefix: c:\users\[redacted]\appdata\local\anthropicclaude\
2026/05/02 21:53:29.695098 Checking for running Squirrel Claude processes...
2026/05/02 21:53:29.711902 No Squirrel Claude processes found
2026/05/02 21:53:29.711902 Checking for existing Claude MSIX packages...
2026/05/02 21:53:29.725486 Installing MSIX: C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix
2026/05/02 21:53:29.726583 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/02 21:53:29.726583 Standard install (not split-account), using AddPackage
2026/05/02 21:53:29.726583 Installing via AddPackage (current-user)...
2026/05/02 21:53:41.484354 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/02 21:53:41.484354 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/05/02 21:54:11.554469 Elevated process exited with code 1
2026/05/02 21:54:11.554469 Elevation failed: elevated installer exited with code 1
2026/05/02 21:54:11.554469 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

Run the installer.

Claude Model

Other

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

latest installer

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_