All it says after the first screans is "laddar 5%" and is stuck there forever. (Laddar means loading in Swedish.)

I've got no idea what to do, I've tried installing the community patches but nothing seems to work. Help! :(

Which drive did you install the game into? I've read that it may behave like this if installed in any drive different than C:.

Have the same problem, and yes did not install it on C:.

By "community patches" do you mean Gentlemen of the Row? If not, try installing that.

The game needs to be installed on a local disk, if you have a local ssd disk and you feel sorry for the space, then you can create a virtual local disk on your hard drive
docs.microsoft.com/en-us/windows-server/storage/disk-management/manage-virtual-hard-disks