[BUG] Claude Desktop installer redirects to Microsoft Store on Windows 11 25H2 (upgraded from Windows 10 Home)

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?

Installer launches, shows "Downloading Claude...", then silently fails and opens the Microsoft Store searching for "claude" — no results found. Installation never completes and Claude Desktop does not appear in the Start menu.

What Should Happen?

Claude Desktop should install successfully and appear in the Start menu after running ClaudeSetup.exe downloaded from claude.com/download.

Error Messages/Logs

No error message shown. Microsoft Store opens with "No results found" for "claude".

Steps to Reproduce

1. Download ClaudeSetup.exe from claude.com/download
2. Run installer as regular user
3. Observe "Downloading Claude..." progress
4. Microsoft Store opens automatically searching "claude" — no results
5. Installation silently fails, Claude Desktop not installed

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Unknown — fresh install attempt

Claude Code Version

N/A — cannot install

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Attempted all known workarounds before reporting:

• Clean removal of previous Claude packages via Get-AppxPackage
• Cleared %APPDATA%\Claude, %LOCALAPPDATA%\Claude, %LOCALAPPDATA%\Packages\Claude_pzs8sxrjxfjjc
• Enabled VirtualMachinePlatform and HypervisorPlatform via Enable-WindowsOptionalFeature
• Set AllowDevelopmentWithoutDevLicense = 1 and AllowAllTrustedApps = 1 in HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock
• Rebooted before retrying
• Tried running installer both as regular user and as Administrator

None resolved the issue. Related to #28892.