Unable to fully uninstall 4.4.1

[quantenemitter]

I'm unable to completely remove outlookcaldavsynchronizer from my system.

Steps to reproduce (at least I think so)

1. Install outlookcaldavsynchronizer 4.1.0 at Windows 11. (I don't remember if my first install was system wide or in user profile)
2. Use it for a while
3. Go to Windows 11 Settings → Applications → Apps → Uninstall.
4. Uninstall outlookcaldavsynchronizer

Expected behavior

outlookcaldavsynchronizer diappears from the system.

Real behavior

outlookcaldavsynchronizer disappears from Windows 11 Settings → Applications → Apps → Uninstall But the powershell--command "winget upgrade" still shows this:

>winget upgrade
Name               ID                                 Version    Verfügbar Quelle
---------------------------------------------------------------------------------
CalDavSynchronizer aluxnimm.outlookcaldavsynchronizer 4.1.0      4.3.0     winget

and that:

> winget upgrade CalDavSynchronizer
Es wurde kein anwendbares Upgrade gefunden. [i. e. there's no upgrade]

Additionally, C:\Program Files (x86)\CalDav... wasn't empty and the registry is full of entries containing the string "caldavsync".

Additional Information

(Re-)installing outlookcaldavsynchronizer v4.1.0 and/or v4.4.1 didn't resolve the problem: winget still thinks, there's a installation of v4.1.0