https://bugs.winehq.org/show_bug.cgi?id=41727
--- Comment #3 from Sebastian Lackner sebastian@fds-team.de --- (In reply to Sebastian Lackner from comment #2)
No, I don't think this issue was fixed. Wine and Wine Staging 2.3 ship a new version of Wine Mono, which is probably the reason why the installer is triggered again.
Actually, the last statement is wrong, the update was merged shortly after the release. You could try if the issue still exists by installing .NET in a fresh prefix and then running "wineboot -u" which is similar to what happens when installing a new version.