I start the game and a window apears and says: FATAL ERROR An internal error occured in Rigs of RoadsTechnical details below: Failed to generate list of installed content.
forum.rigsofrods.org
I'm guessing your username contains cyrillic letters
As Mike said, this is a known issue that has hopefully been fixed in the recent development builds. You can download the newest one from here: https://rigs-of-rods.itch.io/rigs-of-rods-dev