[BUG]

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?

Your Windows version: 10.0.26200
Your Claude Desktop installer version: 056ee2be623b207f6a4d24dfb1b2fb5a82db0ecf
The exact error code: 0x80073CF6
Attach the full log file from: C:\Users\user_name\AppData\Local\Temp\ClaudeSetup.log
The steps you've already tried (clearing temp, removing old packages, etc.)
Include the error message: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

This is a system-level Windows MSIX installation issue that the Anthropic team will need to investigate directly with your log file.

What Should Happen?

Installation should be successful.

Error Messages/Logs

2026/08/11 17:22:23.873932 Log file: C:\Users\visru\AppData\Local\Temp\ClaudeSetup.log
2026/08/11 17:22:23.875631 === Claude Setup 85cb5c02268829ab7605f76dfa13a4217159ca9f started ===
2026/08/11 17:22:23.877285 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/08/11 17:22:23.877285 Windows edition: CoreSingleLanguage
2026/08/11 17:22:23.878314 Windows version: 10.0.26200
2026/08/11 17:22:23.878314 Native arch: x64
2026/08/11 17:22:23.878314 Elevation type: Limited
2026/08/11 17:22:23.878314 Is elevated: false
2026/08/11 17:22:23.878314 Sideloading enabled: true
2026/08/11 17:22:23.878314 S Mode: false
2026/08/11 17:22:23.878314 Conflicting service: false
2026/08/11 17:22:23.878314 Running in non-elevated context
2026/08/11 17:22:23.878314 User can elevate — installing MSIX directly
2026/08/11 17:22:23.905607 Splash: 400x300, 8 frame(s), animated=true
2026/08/11 17:22:23.906115 System DPI: 96 (scale: 100%)
2026/08/11 17:22:23.972623 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/08/11 17:22:23.973148 Downloading MSIX to C:\Users\visru\AppData\Local\Temp\Claude-1170662481.msix
2026/08/11 17:22:23.991305 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/08/11 17:22:24.491833 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.26832.0/Claude-056ee2be623b207f6a4d24dfb1b2fb5a82db0ecf.msix"): winapi error #12180
2026/08/11 17:22:25.199064 Download progress: 10% (26640192 / 266210150 bytes)
2026/08/11 17:22:25.716760 Download progress: 20% (53247600 / 266210150 bytes)
2026/08/11 17:22:26.277249 Download progress: 30% (79871392 / 266210150 bytes)
2026/08/11 17:22:26.818876 Download progress: 40% (106495200 / 266210150 bytes)
2026/08/11 17:22:27.370145 Download progress: 50% (133135376 / 266210150 bytes)
2026/08/11 17:22:27.924835 Download progress: 60% (159726400 / 266210150 bytes)
2026/08/11 17:22:28.472852 Download progress: 70% (186350208 / 266210150 bytes)
2026/08/11 17:22:29.042258 Download progress: 80% (212990384 / 266210150 bytes)
2026/08/11 17:22:29.593082 Download progress: 90% (239597792 / 266210150 bytes)
2026/08/11 17:22:30.251358 Download progress: 100% (266210150 / 266210150 bytes)
2026/08/11 17:22:30.254113 Download complete: 266210150 bytes, SHA256: 6dc210bca31b55c9fa307d11c6b13a42c7f3a3886ccc35ca2ecb7e9fceba0139
2026/08/11 17:22:30.255801 Download complete
2026/08/11 17:22:30.327957 Self-elevating: C:\Users\visru\Downloads\Claude Setup.exe --elevated --msix-path "C:\Users\visru\AppData\Local\Temp\Claude-1170662481.msix" --log-path "C:\Users\visru\AppData\Local\Temp\ClaudeSetup.log"
2026/08/11 17:22:41.892453 Waiting for elevated process to complete...
2026/08/11 17:22:41.903904 Log file: C:\Users\visru\AppData\Local\Temp\ClaudeSetup.log
2026/08/11 17:22:41.904433 === Claude Setup 85cb5c02268829ab7605f76dfa13a4217159ca9f started ===
2026/08/11 17:22:41.905723 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/08/11 17:22:41.906317 Windows edition: CoreSingleLanguage
2026/08/11 17:22:41.906883 Windows version: 10.0.26200
2026/08/11 17:22:41.906883 Native arch: x64
2026/08/11 17:22:41.906883 Elevation type: Full
2026/08/11 17:22:41.906883 Is elevated: true
2026/08/11 17:22:41.906883 Sideloading enabled: true
2026/08/11 17:22:41.906883 S Mode: false
2026/08/11 17:22:41.906883 Conflicting service: false
2026/08/11 17:22:41.906883 Running in elevated context
2026/08/11 17:22:41.906883 Installing MSIX from C:\Users\visru\AppData\Local\Temp\Claude-1170662481.msix (all-users: false)
2026/08/11 17:22:41.938020 Splash: 400x300, 8 frame(s), animated=true
2026/08/11 17:22:41.938020 System DPI: 96 (scale: 100%)
2026/08/11 17:22:42.009896 Verifying Authenticode signature on C:\Users\visru\AppData\Local\Temp\Claude-1170662481.msix
2026/08/11 17:22:43.158762 WinVerifyTrust: MSIX signature is valid
2026/08/11 17:22:43.621366 Signature verified: MSIX signer matches bootstrapper
2026/08/11 17:22:43.623349 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/08/11 17:22:43.623349 Squirrel process prefix: c:\users\visru\appdata\local\anthropicclaude\
2026/08/11 17:22:43.623349 Checking for running Squirrel Claude processes...
2026/08/11 17:22:43.639335 No Squirrel Claude processes found
2026/08/11 17:22:43.639335 Checking for existing Claude MSIX packages...
2026/08/11 17:22:43.669128 Installing MSIX: C:\Users\visru\AppData\Local\Temp\Claude-1170662481.msix
2026/08/11 17:22:43.669128 Standard install (not split-account), using AddPackage
2026/08/11 17:22:43.669128 Installing via AddPackage (current-user)...
2026/08/11 17:23:02.225761 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/08/11 17:23:02.226759 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/08/11 17:23:08.395486 Elevated process exited with code 1
2026/08/11 17:23:08.395486 Elevation failed: elevated installer exited with code 1
2026/08/11 17:23:08.395486 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/08/11 17:26:08.130883 Log file: C:\Users\visru\AppData\Local\Temp\ClaudeSetup.log
2026/08/11 17:26:08.132075 === Claude Setup 056ee2be623b207f6a4d24dfb1b2fb5a82db0ecf started ===
2026/08/11 17:26:08.133231 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/08/11 17:26:08.133231 Windows edition: CoreSingleLanguage
2026/08/11 17:26:08.133872 Windows version: 10.0.26200
2026/08/11 17:26:08.133872 Native arch: x64
2026/08/11 17:26:08.133872 Elevation type: Limited
2026/08/11 17:26:08.133872 Is elevated: false
2026/08/11 17:26:08.133872 Sideloading enabled: true
2026/08/11 17:26:08.133872 S Mode: false
2026/08/11 17:26:08.133872 Conflicting service: false
2026/08/11 17:26:08.133872 Running in non-elevated context
2026/08/11 17:26:08.133872 User can elevate — installing MSIX directly
2026/08/11 17:26:08.154889 Splash: 400x300, 8 frame(s), animated=true
2026/08/11 17:26:08.154889 System DPI: 96 (scale: 100%)
2026/08/11 17:26:08.241288 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/08/11 17:26:08.242345 Downloading MSIX to C:\Users\visru\AppData\Local\Temp\Claude-2766473741.msix
2026/08/11 17:26:08.260202 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/08/11 17:26:08.812703 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.26832.0/Claude-056ee2be623b207f6a4d24dfb1b2fb5a82db0ecf.msix"): winapi error #12180
2026/08/11 17:26:09.447101 Download progress: 10% (26640192 / 266210150 bytes)
2026/08/11 17:26:09.994048 Download progress: 20% (53263984 / 266210150 bytes)
2026/08/11 17:26:10.540477 Download progress: 30% (79887776 / 266210150 bytes)
2026/08/11 17:26:11.086513 Download progress: 40% (106495200 / 266210150 bytes)
2026/08/11 17:26:11.634478 Download progress: 50% (133135376 / 266210150 bytes)
2026/08/11 17:26:12.195402 Download progress: 60% (159742784 / 266210150 bytes)
2026/08/11 17:26:12.733044 Download progress: 70% (186350208 / 266210150 bytes)
2026/08/11 17:26:13.274497 Download progress: 80% (212974000 / 266210150 bytes)
2026/08/11 17:26:13.819878 Download progress: 90% (239597792 / 266210150 bytes)
2026/08/11 17:26:14.471199 Download progress: 100% (266210150 / 266210150 bytes)
2026/08/11 17:26:14.472788 Download complete: 266210150 bytes, SHA256: 6dc210bca31b55c9fa307d11c6b13a42c7f3a3886ccc35ca2ecb7e9fceba0139
2026/08/11 17:26:14.473742 Download complete
2026/08/11 17:26:14.518151 Self-elevating: C:\Users\visru\Downloads\Claude Setup (1).exe --elevated --msix-path "C:\Users\visru\AppData\Local\Temp\Claude-2766473741.msix" --log-path "C:\Users\visru\AppData\Local\Temp\ClaudeSetup.log"
2026/08/11 17:26:17.232555 Waiting for elevated process to complete...
2026/08/11 17:26:17.248620 Log file: C:\Users\visru\AppData\Local\Temp\ClaudeSetup.log
2026/08/11 17:26:17.249317 === Claude Setup 056ee2be623b207f6a4d24dfb1b2fb5a82db0ecf started ===
2026/08/11 17:26:17.250423 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/08/11 17:26:17.251146 Windows edition: CoreSingleLanguage
2026/08/11 17:26:17.251695 Windows version: 10.0.26200
2026/08/11 17:26:17.251695 Native arch: x64
2026/08/11 17:26:17.251695 Elevation type: Full
2026/08/11 17:26:17.251695 Is elevated: true
2026/08/11 17:26:17.251695 Sideloading enabled: true
2026/08/11 17:26:17.251695 S Mode: false
2026/08/11 17:26:17.251695 Conflicting service: false
2026/08/11 17:26:17.251695 Running in elevated context
2026/08/11 17:26:17.252270 Installing MSIX from C:\Users\visru\AppData\Local\Temp\Claude-2766473741.msix (all-users: false)
2026/08/11 17:26:17.277982 Splash: 400x300, 8 frame(s), animated=true
2026/08/11 17:26:17.278619 System DPI: 96 (scale: 100%)
2026/08/11 17:26:17.340508 Verifying Authenticode signature on C:\Users\visru\AppData\Local\Temp\Claude-2766473741.msix
2026/08/11 17:26:18.369669 WinVerifyTrust: MSIX signature is valid
2026/08/11 17:26:18.823106 Signature verified: MSIX signer matches bootstrapper
2026/08/11 17:26:18.824834 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/08/11 17:26:18.824834 Squirrel process prefix: c:\users\visru\appdata\local\anthropicclaude\
2026/08/11 17:26:18.824834 Checking for running Squirrel Claude processes...
2026/08/11 17:26:18.840699 No Squirrel Claude processes found
2026/08/11 17:26:18.841350 Checking for existing Claude MSIX packages...
2026/08/11 17:26:18.862860 Installing MSIX: C:\Users\visru\AppData\Local\Temp\Claude-2766473741.msix
2026/08/11 17:26:18.862860 Standard install (not split-account), using AddPackage
2026/08/11 17:26:18.862860 Installing via AddPackage (current-user)...
2026/08/11 17:26:37.149878 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/08/11 17:26:37.150886 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/08/11 17:26:41.782857 Elevated process exited with code 1
2026/08/11 17:26:41.782857 Elevation failed: elevated installer exited with code 1
2026/08/11 17:26:41.782857 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/08/11 17:29:13.289275 Log file: C:\Users\visru\AppData\Local\Temp\ClaudeSetup.log
2026/08/11 17:29:13.291432 === Claude Setup 056ee2be623b207f6a4d24dfb1b2fb5a82db0ecf started ===
2026/08/11 17:29:13.293074 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/08/11 17:29:13.293074 Windows edition: CoreSingleLanguage
2026/08/11 17:29:13.294562 Windows version: 10.0.26200
2026/08/11 17:29:13.294562 Native arch: x64
2026/08/11 17:29:13.294562 Elevation type: Full
2026/08/11 17:29:13.294562 Is elevated: true
2026/08/11 17:29:13.294562 Sideloading enabled: true
2026/08/11 17:29:13.294562 S Mode: false
2026/08/11 17:29:13.294562 Conflicting service: false
2026/08/11 17:29:13.294562 Running in non-elevated context
2026/08/11 17:29:13.294562 User can elevate — installing MSIX directly
2026/08/11 17:29:13.325264 Splash: 400x300, 8 frame(s), animated=true
2026/08/11 17:29:13.325264 System DPI: 96 (scale: 100%)
2026/08/11 17:29:13.370103 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/08/11 17:29:13.370635 Downloading MSIX to C:\Users\visru\AppData\Local\Temp\Claude-2844531842.msix
2026/08/11 17:29:13.392485 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/08/11 17:29:13.892443 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.26832.0/Claude-056ee2be623b207f6a4d24dfb1b2fb5a82db0ecf.msix"): winapi error #12180
2026/08/11 17:29:14.576437 Download progress: 10% (26640192 / 266210150 bytes)
2026/08/11 17:29:15.127537 Download progress: 20% (53263984 / 266210150 bytes)
2026/08/11 17:29:15.677509 Download progress: 30% (79887792 / 266210150 bytes)
2026/08/11 17:29:16.215405 Download progress: 40% (106495200 / 266210150 bytes)
2026/08/11 17:29:16.761824 Download progress: 50% (133135376 / 266210150 bytes)
2026/08/11 17:29:17.308543 Download progress: 60% (159742784 / 266210150 bytes)
2026/08/11 17:29:17.854802 Download progress: 70% (186350208 / 266210150 bytes)
2026/08/11 17:29:18.403924 Download progress: 80% (212990384 / 266210150 bytes)
2026/08/11 17:29:18.949780 Download progress: 90% (239597792 / 266210150 bytes)
2026/08/11 17:29:19.494034 Download progress: 100% (266210150 / 266210150 bytes)
2026/08/11 17:29:19.497104 Download complete: 266210150 bytes, SHA256: 6dc210bca31b55c9fa307d11c6b13a42c7f3a3886ccc35ca2ecb7e9fceba0139
2026/08/11 17:29:19.498216 Download complete
2026/08/11 17:29:19.538859 Self-elevating: C:\Users\visru\Downloads\Claude Setup (1).exe --elevated --msix-path "C:\Users\visru\AppData\Local\Temp\Claude-2844531842.msix" --log-path "C:\Users\visru\AppData\Local\Temp\ClaudeSetup.log"
2026/08/11 17:29:19.829310 Waiting for elevated process to complete...
2026/08/11 17:29:19.840860 Log file: C:\Users\visru\AppData\Local\Temp\ClaudeSetup.log
2026/08/11 17:29:19.841381 === Claude Setup 056ee2be623b207f6a4d24dfb1b2fb5a82db0ecf started ===
2026/08/11 17:29:19.842578 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/08/11 17:29:19.843109 Windows edition: CoreSingleLanguage
2026/08/11 17:29:19.843652 Windows version: 10.0.26200
2026/08/11 17:29:19.843652 Native arch: x64
2026/08/11 17:29:19.843652 Elevation type: Full
2026/08/11 17:29:19.843652 Is elevated: true
2026/08/11 17:29:19.843652 Sideloading enabled: true
2026/08/11 17:29:19.843652 S Mode: false
2026/08/11 17:29:19.843652 Conflicting service: false
2026/08/11 17:29:19.843652 Running in elevated context
2026/08/11 17:29:19.844190 Installing MSIX from C:\Users\visru\AppData\Local\Temp\Claude-2844531842.msix (all-users: false)
2026/08/11 17:29:19.865148 Splash: 400x300, 8 frame(s), animated=true
2026/08/11 17:29:19.865148 System DPI: 96 (scale: 100%)
2026/08/11 17:29:19.918998 Verifying Authenticode signature on C:\Users\visru\AppData\Local\Temp\Claude-2844531842.msix
2026/08/11 17:29:21.026535 WinVerifyTrust: MSIX signature is valid
2026/08/11 17:29:21.475146 Signature verified: MSIX signer matches bootstrapper
2026/08/11 17:29:21.476418 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/08/11 17:29:21.476418 Squirrel process prefix: c:\users\visru\appdata\local\anthropicclaude\
2026/08/11 17:29:21.476418 Checking for running Squirrel Claude processes...
2026/08/11 17:29:21.493607 No Squirrel Claude processes found
2026/08/11 17:29:21.493607 Checking for existing Claude MSIX packages...
2026/08/11 17:29:21.515110 Installing MSIX: C:\Users\visru\AppData\Local\Temp\Claude-2844531842.msix
2026/08/11 17:29:21.515110 Standard install (not split-account), using AddPackage
2026/08/11 17:29:21.515110 Installing via AddPackage (current-user)...
2026/08/11 17:29:39.576141 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/08/11 17:29:39.576141 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/08/11 17:29:42.843241 Elevated process exited with code 1
2026/08/11 17:29:42.843241 Elevation failed: elevated installer exited with code 1
2026/08/11 17:29:42.843241 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

1. Run the windows installer.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

NA

Platform

Other

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_