[BUG] Claude Setup.exe installation issue despite trying all fixes in different repos i

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?

When I try to run Claude Setup.exe, I keep getting the error that Claude_1.12603.1.0_x64__pzs8sxrjxfjjc is still on the system even after I Remove-AppxPackage in Power Shell as administrator. I have checked for all MSIX deployment issues. These do not give any errors anymore.

I have also succesfully completed component cleanup with the DISM/SFC scan. No errors now.

I have checked for Stale package volume in registry by opening Registry Editor (regedit) and go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Appx\PackageVolumes to check its 'MountPoint'.

I ensured my Developer Mode is "ON" to ensure I have full admin access.

Despite all of this it seems like Claude_1.12603.1.0_x64__pzs8sxrjxfjjc is still on the system.

I have also tried
powershell
reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\Appx" /v AllowAllTrustedApps /t REG_DWORD /d 1 /f
reg add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock" /v AllowDevelopmentWithoutDevLicense /t REG_DWORD /d 1 /f

Previously, I have deleted a partition on my PC. I reset the PC and introduced a new partition of my C drive into a C and D drives. This error has been occuring ever since i made the partition.

What Should Happen?

Claude Desktop should install successfully and launch after the installation process completes.

Error Messages/Logs

2026/09/10 16:03:38.159786 Log file: C:\Users\SRIVAT~1\AppData\Local\Temp\ClaudeSetup.log
2026/09/10 16:03:38.161937 === Claude Setup 41ad1dff5275eedc8af25989f59f33c5efe14063 started ===
2026/09/10 16:03:38.162472 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/09/10 16:03:38.163007 Windows edition: Professional
2026/09/10 16:03:38.164070 Windows version: 10.0.26200
2026/09/10 16:03:38.164070 Native arch: x64
2026/09/10 16:03:38.164070 Elevation type: Limited
2026/09/10 16:03:38.164070 Is elevated: false
2026/09/10 16:03:38.164070 Sideloading enabled: true
2026/09/10 16:03:38.164070 S Mode: false
2026/09/10 16:03:38.164070 Conflicting service: false
2026/09/10 16:03:38.164070 Running in non-elevated context
2026/09/10 16:03:38.164070 User can elevate — installing MSIX directly
2026/09/10 16:03:38.192650 Splash: 400x300, 8 frame(s), animated=true
2026/09/10 16:03:38.192650 System DPI: 144 (scale: 150%)
2026/09/10 16:03:38.253081 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/09/10 16:03:38.254123 Downloading MSIX to C:\Users\SRIVAT~1\AppData\Local\Temp\Claude-4006883765.msix
2026/09/10 16:03:38.273482 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/09/10 16:03:38.530270 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.49585.0/Claude-41ad1dff5275eedc8af25989f59f33c5efe14063.msix"): winapi error #12180
2026/09/10 16:03:43.293115 Download progress: 10% (27754288 / 277248271 bytes)
2026/09/10 16:03:45.721974 Download progress: 20% (55475808 / 277248271 bytes)
2026/09/10 16:03:48.279234 Download progress: 30% (83197328 / 277248271 bytes)
2026/09/10 16:03:50.701874 Download progress: 40% (110918848 / 277248271 bytes)
2026/09/10 16:03:53.244411 Download progress: 50% (138656736 / 277248271 bytes)
2026/09/10 16:03:55.695031 Download progress: 60% (166378256 / 277248271 bytes)
2026/09/10 16:03:58.409810 Download progress: 70% (194083392 / 277248271 bytes)
2026/09/10 16:04:00.835911 Download progress: 80% (221804912 / 277248271 bytes)
2026/09/10 16:04:03.346567 Download progress: 90% (249526432 / 277248271 bytes)
2026/09/10 16:04:05.746914 Download progress: 100% (277248271 / 277248271 bytes)
2026/09/10 16:04:05.747562 Download complete: 277248271 bytes, SHA256: dfc789cb60a88a5ba794c25903ebfc0f4552c650a157933b056c984366dbedca
2026/09/10 16:04:05.748088 Download complete
2026/09/10 16:04:05.760857 Self-elevating: C:\Users\Srivats Mohan\Downloads\Claude Setup (6).exe --elevated --msix-path "C:\Users\SRIVAT~1\AppData\Local\Temp\Claude-4006883765.msix" --log-path "C:\Users\SRIVAT~1\AppData\Local\Temp\ClaudeSetup.log"
2026/09/10 16:04:08.996463 Waiting for elevated process to complete...
2026/09/10 16:04:09.022630 Log file: C:\Users\SRIVAT~1\AppData\Local\Temp\ClaudeSetup.log
2026/09/10 16:04:09.023162 === Claude Setup 41ad1dff5275eedc8af25989f59f33c5efe14063 started ===
2026/09/10 16:04:09.023678 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/09/10 16:04:09.024192 Windows edition: Professional
2026/09/10 16:04:09.025218 Windows version: 10.0.26200
2026/09/10 16:04:09.025218 Native arch: x64
2026/09/10 16:04:09.025218 Elevation type: Full
2026/09/10 16:04:09.025218 Is elevated: true
2026/09/10 16:04:09.025218 Sideloading enabled: true
2026/09/10 16:04:09.025218 S Mode: false
2026/09/10 16:04:09.025218 Conflicting service: false
2026/09/10 16:04:09.025218 Running in elevated context
2026/09/10 16:04:09.025218 Installing MSIX from C:\Users\SRIVAT~1\AppData\Local\Temp\Claude-4006883765.msix (all-users: false)
2026/09/10 16:04:09.059668 Splash: 400x300, 8 frame(s), animated=true
2026/09/10 16:04:09.059668 System DPI: 144 (scale: 150%)
2026/09/10 16:04:09.114017 Verifying Authenticode signature on C:\Users\SRIVAT~1\AppData\Local\Temp\Claude-4006883765.msix
2026/09/10 16:04:10.880361 WinVerifyTrust: MSIX signature is valid
2026/09/10 16:04:11.684013 Signature verified: MSIX signer matches bootstrapper
2026/09/10 16:04:11.687709 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/09/10 16:04:11.687709 Squirrel process prefix: c:\users\srivats mohan\appdata\local\anthropicclaude\
2026/09/10 16:04:11.687709 Checking for running Squirrel Claude processes...
2026/09/10 16:04:11.695608 No Squirrel Claude processes found
2026/09/10 16:04:11.695608 Checking for existing Claude MSIX packages...
2026/09/10 16:04:11.705543 Removing: Claude_1.12603.1.0_x64__pzs8sxrjxfjjc
2026/09/10 16:04:11.708729 Windows rejected data-preserving removal for Claude_1.12603.1.0_x64__pzs8sxrjxfjjc (0x80073CFA, requires developer mode); relying on in-place update
2026/09/10 16:04:11.714955 Installing MSIX: C:\Users\SRIVAT~1\AppData\Local\Temp\Claude-4006883765.msix
2026/09/10 16:04:11.715961 Standard install (not split-account), using AddPackage
2026/09/10 16:04:11.715961 Installing via AddPackage (current-user)...
2026/09/10 16:04:11.987191 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF9
2026/09/10 16:04:11.987701 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF9

Please share this log with us.
2026/09/10 16:04:16.888195 Elevated process exited with code 1
2026/09/10 16:04:16.888195 Elevation failed: elevated installer exited with code 1
2026/09/10 16:04:16.888195 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

Download Claude Desktop installer from https://claude.ai/download (Windows x64)
Run the installer (Claude Setup.exe)
Installer downloads MSIX package successfully (220354768 bytes, SHA256 verified)
Installer attempts AddPackage — fails with HRESULT 0x80073D0D
Error dialog appears: "Administrator access is required to install Claude with full features"
Clicking "Try again" reproduces the same error

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.9659.2.0

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

I have tried troubleshooting using the responses here as well:
https://github.com/anthropics/claude-code/issues/64029

And have referred to every possible solution FinAI and Claude can give me. But there seems to be no fix. C and D drives. This error has been occuring ever since i made the partition.