If you need version 1.40 for modding or performance reasons, simply follow the beta branch instructions above. It takes two minutes and requires no additional keys, downloads, or compromises to your computer's security.
When you purchase Euro Truck Simulator 2, you do not buy a key for a specific version. You buy a license for the game itself. That one product key grants you access to the base game and all future updates (including version 1.40, 1.41, etc.) via the Steam platform. ets2 1.40 product key
Do not waste time on keygens, serial websites, or shady forums. The risks far outweigh any perceived reward. ETS2 is frequently available for under $10, and the developers at SCS Software have continuously supported the game for over a decade. They deserve your support. If you need version 1