[Bug] MSIX installation failed with error code 0x80073CF6 on Windows 11

Bug Description
2026/08/22 09:19:43.822907 Log file: C:\Users\JDM-SE~1\AppData\Local\Temp\ClaudeSetup.log 2026/08/22 09:19:43.838915 === Claude Setup 255293a41a25d54c5177aa9614fb4cd620e70b78 started === 2026/08/22 09:19:43.838915 AllowDevelopmentWithoutDevLicense found with value: 1 2026/08/22 09:19:43.838915 Windows edition: ProfessionalWorkstation 2026/08/22 09:19:43.839432 Windows version: 10.0.22631 2026/08/22 09:19:43.839432 Native arch: x64 2026/08/22 09:19:43.839432 Elevation type: Limited 2026/08/22 09:19:43.839432 Is elevated: false 2026/08/22 09:19:43.839432 Sideloading enabled: true 2026/08/22 09:19:43.839432 S Mode: false 2026/08/22 09:19:43.839949 Conflicting service: false 2026/08/22 09:19:43.839949 Running in non-elevated context 2026/08/22 09:19:43.839949 User can elevate — installing MSIX directly 2026/08/22 09:19:43.853227 Splash: 400x300, 8 frame(s), animated=true 2026/08/22 09:19:43.853743 System DPI: 96 (scale: 100%) 2026/08/22 09:19:43.882435 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect 2026/08/22 09:19:43.883473 Downloading MSIX to C:\Users\JDM-SE~1\AppData\Local\Temp\Claude-3748625599.msix 2026/08/22 09:19:43.891247 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180 2026/08/22 09:19:44.173747 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.34493.1/Claude-255293a41a25d54c5177aa9614fb4cd620e70b78.msix"): winapi error #12180 2026/08/22 09:19:44.454325 Download progress: 10% (24772432 / 247405438 bytes) 2026/08/22 09:19:44.673899 Download progress: 20% (49512080 / 247405438 bytes) 2026/08/22 09:19:44.896295 Download progress: 30% (74235344 / 247405438 bytes) 2026/08/22 09:19:45.109383 Download progress: 40% (98974992 / 247405438 bytes) 2026/08/22 09:19:45.325535 Download progress: 50% (123731024 / 247405438 bytes) 2026/08/22 09:19:45.548596 Download progress: 60% (148454304 / 247405438 bytes) 2026/08/22 09:19:45.768543 Download progress: 70% (173193952 / 247405438 bytes) 2026/08/22 09:19:46.000119 Download progress: 80% (197933600 / 247405438 bytes) 2026/08/22 09:19:46.215769 Download progress: 90% (222673248 / 247405438 bytes) 2026/08/22 09:19:46.439617 Download progress: 100% (247405438 / 247405438 bytes) 2026/08/22 09:19:46.441748 Download complete: 247405438 bytes, SHA256: ad5ead595fec1977c0ccb1d7fab3be040773b716451431dbd6bab457ba31a55c 2026/08/22 09:19:46.442766 Download complete 2026/08/22 09:19:46.452558 Self-elevating: E:\Downloads\Claude Setup (3).exe --elevated --msix-path "C:\Users\JDM-SE~1\AppData\Local\Temp\Claude-3748625599.msix" --log-path "C:\Users\JDM-SE~1\AppData\Local\Temp\ClaudeSetup.log" 2026/08/22 09:19:48.606476 Waiting for elevated process to complete... 2026/08/22 09:19:48.619482 Log file: C:\Users\JDM-SE~1\AppData\Local\Temp\ClaudeSetup.log 2026/08/22 09:19:48.633957 === Claude Setup 255293a41a25d54c5177aa9614fb4cd620e70b78 started === 2026/08/22 09:19:48.633957 AllowDevelopmentWithoutDevLicense found with value: 1 2026/08/22 09:19:48.633957 Windows edition: ProfessionalWorkstation 2026/08/22 09:19:48.634471 Windows version: 10.0.22631 2026/08/22 09:19:48.634471 Native arch: x64 2026/08/22 09:19:48.634471 Elevation type: Full 2026/08/22 09:19:48.634471 Is elevated: true 2026/08/22 09:19:48.634471 Sideloading enabled: true 2026/08/22 09:19:48.634471 S Mode: false 2026/08/22 09:19:48.634471 Conflicting service: false 2026/08/22 09:19:48.634471 Running in elevated context 2026/08/22 09:19:48.634471 Installing MSIX from C:\Users\JDM-SE~1\AppData\Local\Temp\Claude-3748625599.msix (all-users: false) 2026/08/22 09:19:48.647549 Splash: 400x300, 8 frame(s), animated=true 2026/08/22 09:19:48.647549 System DPI: 96 (scale: 100%) 2026/08/22 09:19:48.675058 Verifying Authenticode signature on C:\Users\JDM-SE~1\AppData\Local\Temp\Claude-3748625599.msix 2026/08/22 09:19:49.474253 WinVerifyTrust: MSIX signature is valid 2026/08/22 09:19:49.902963 Signature verified: MSIX signer matches bootstrapper 2026/08/22 09:19:49.904529 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc 2026/08/22 09:19:49.904529 Squirrel process prefix: c:\users\jdm-server\appdata\local\anthropicclaude\ 2026/08/22 09:19:49.904529 Checking for running Squirrel Claude processes... 2026/08/22 09:19:49.912295 No Squirrel Claude processes found 2026/08/22 09:19:49.912295 Checking for existing Claude MSIX packages... 2026/08/22 09:19:49.926293 Installing MSIX: C:\Users\JDM-SE~1\AppData\Local\Temp\Claude-3748625599.msix 2026/08/22 09:19:49.926293 Standard install (not split-account), using AddPackage 2026/08/22 09:19:49.926293 Installing via AddPackage (current-user)... 2026/08/22 09:20:13.195197 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6 2026/08/22 09:20:13.195197 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6 Please share this log with us. 2026/08/22 09:20:30.122221 Elevated process exited with code 1 2026/08/22 09:20:30.122221 Elevation failed: elevated installer exited with code 1 20…
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