Because ETS2 auto-updates to the latest version by default, you must use Steam’s "Betas" feature to roll back to 1.38.
You can download a free trial for Euro Truck Simulator 2 on this page. To buy a full version of ETS2, please buy a Steam key here. Euro Truck Simulator 2 Euro Truck Simulator 2 1.38 Release Download Euro Truck Simulator 2 1.38
A major visual upgrade that creates more realistic shadows where objects meet, giving the trucks and world a more grounded look. Lille City Reskin: Because ETS2 auto-updates to the latest version by
If you are using the older, non-Steam version of the game, you can download update patches from the official website: Legacy Updates page on the official Euro Truck Simulator 2 Euro Truck Simulator 2 Euro Truck Simulator 2 1
Version 1.38 is picky about load order. Do not mix mods made for 1.39 with 1.38. Use a (like Mod Manager 2) and check the mod description for "Works with 1.38."