For an alternative I’d start looking here:
https://www.xmind.net/
For sticking with wine, first of all I’d backup my wineprefix - in case there’s anything useful in it, which works already.
Then I’d try to force reinstall dotnet, something like
winetricks --force dotnet40
Then give it a go.
If that fails, I’d start over with a brand new empty wineprefix, and retry…