Studio not starting after new release

Last night, I've updated my Trados Studio to release 16.1.8.4404.

I was able to start it today, but it would not let me open a file in a Groupshare project I was working on yesterday (the project is not the problem), Trados claimed the file did not have an UserID field or something. I've restarted my computer and now Trados Studio won't even open.

I need help ASAP, as I have deadlines.