Error installing Apps 365, command not supported.

Try this out:

1. Try Repair via Command Prompt

If the GUI repair fails, you can invoke the repair manually using Command Prompt:

"C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeClickToRun.exe" scenario=Repair system=x64 culture=en-us RepairType=FullRepair DisplayLevel=True

Make sure the path matches your system. If Office is installed in a different location, adjust accordingly.

2.  Deep Clean Office Remnants

Even after using the MS Cleanup tool, some registry entries or leftover folders might be interfering.

• Delete these folders manually:
• C:\Program Files\Microsoft Office
• C:\Program Files\Common Files\Microsoft Shared\ClickToRun
• %ProgramData%\Microsoft\Office
• %LocalAppData%\Microsoft\Office
• Then run CCleaner or a similar registry cleaner to remove orphaned entries.

3. Use Offline Installer

Instead of relying on the web-based installer, try downloading the full offline installer for Microsoft 365. This bypasses some of the Click-to-Run dependencies that may be failing.

4. Create a New Windows Profile

Sometimes the issue is tied to the user profile itself. Try installing Office under a new local admin account to rule out profile corruption.

5. Check Group Policy or Registry Restrictions

If this is a domain-joined machine, group policies or registry keys might be blocking certain commands.

• Check:
  HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Office
  Look for any restrictive keys under ClickToRun or Common.