If you encounter issues, verifying the game files can help:
Because you’re downgrading, Steam will automatically give you DLC files for maps you don’t own. You need the actual DLC asset files for Iberia, Black Sea, etc. euro truck simulator 2 v143340s all dlc install
Installing the "All DLC" package ensures you have the full European experience. This includes: Map Expansions If you encounter issues, verifying the game files