Over 5,000 mods on Steam Workshop (trucks, trailers, skins, sounds) require the genuine Steam version. An ISO file cannot access the Steam API.
ETS2 frequently appears in Humble Bundles (e.g., “Pay $10 for 5 simulation games”) or GeForce Now (cloud streaming). You are playing the real game without ever downloading a risky ISO. Euro Truck Simulator 2 Iso File Download For Pc