I don't follow this thread very actively, so would recommend contacting me about issues directly instead of posting here. All of the above issues should already be fixed, however, or is probably out of my control and needs to be fixed on your end (which I can help with).
I've had two other cases of people having an infinite loading screen like the above post. In both cases it was their anti-virus removing the executable (which is responsible for actually running checks), preventing anything from loading. If the /resources/app/api/win-x86/MapsetVerifierBackend.exe is missing then this is most likely what happened.
As for the program never starting you could try moving the installation to another disk, which worked last time someone brought up the issue.