Problem with opening projects

Hello - I just wanted to export my animations into unreal to play a bit.

When I opened a new project for that, it told me that it needed 2 plugins to work. I installed those plugins and after that I was no longer able to open any project, it would just get stuck at 39% on initializing and also using basically all my CPU - I restarted and tried again to no avail. I tried to uninstall those plugins and open a new project, but this time I didn’t install those plugins, but unfortunately it would still get stuck at 39 %.

What should I do in order to fix this?