Hello @Rospo, welcome to the forum.
Installing MCEBuddy on Windows 11 Pro Insider Preview can sometimes be tricky because the Insider builds occasionally change how the Windows Installer service or security permissions behave.
Since you’ve already tried a basic uninstall and registry cleaning, it’s possible that the MCEBuddy Service itself wasn’t fully removed, or the Windows Installer registration for the product is stuck in a “ghost” state.
Here is a plan to get you back on track, based on our Common Install/Uninstall Issues Guide:
4. Check Windows Event Viewer
If it still fails, the reason is likely logged by Windows:
- Open Event Viewer (search for it in the Start menu).
- Go to Windows Logs > Application.
- Look for “Error” or “Information” entries from MsiInstaller at the exact time you tried to run the setup. If you find an error code (like
1603), please post it here!
Let us know if deleting that specific Registry key in step 2 helps, as that is the most common reason for the “silent failure” during an upgrade.