Oh, I am sorry :( and will try my best for translation:
I had installed "Microsoft Visual Studio Community 2019" (Version 16.11) and through this program the ".NET SDK 5.0.404 (x64) from Visual Studio" (Version 5.4.421.57211) on my machine (Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz 2.70 GHz x64, 8 GB RAM with 64-Bit Win11Pro 21H2 Build 22000.469). Then I (wrongly?!) uninstalled VSS, without purging the components through "Modify" within the program. Now I cannot remove the .NET SDK - trying in System Control, I get the error message "must be uninstalled through VSS"; in VSS (same or newest version) however, it is not listed as a component.
Does anybody know this problem and/or knows a solution? Thanks a lot in advance!