Some game's files might be missing, just download them there[drive.google.com] (google drive link) and put it in your game's folder. (don't be scared, there are no malicious .exe or .dll files, just an .zip archive containing three .p3d files)

If you've got fixed crashing on startup, you might have a problem when your game gets stuck on loading screen. There's a fix for this one too: download audio_german.rcf file (1.9gb file compressed to 1.2gb, get it from here[drive.google.com] or here[mega.nz]) and extract it to your game's folder (same as two files before).