https://bugs.winehq.org/show_bug.cgi?id=49915
Michael McGuire spoon0042@hotmail.com changed:
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--- Comment #7 from Michael McGuire spoon0042@hotmail.com --- .net install has known issues: bug 49897
You most likely want to be using winetricks to install dotnet452 anyway, and if up to date it won't attempt to install with wine 5.12 or later. You can temporarily downgrade to 5.11 to install if that's what you need. You'll want to delete the wineprefix and start fresh.
And it may still fail; there's a few posts on the forum that could be the same issue with no solution.