The product key for Euro Truck Simulator 2 is a 16-character code that is used to activate the game. If you've purchased the game through the official website or an authorized retailer, your product key should be found in your purchase confirmation email or in the case of a physical copy, on the box or card.
On Steam:
Executive Summary The search for product keys for specific versions of Euro Truck Simulator 2 (ETS2), such as version 1.31 or 1.35, is a common request among the modding community. These specific versions are often sought after because they are the "stable branches" required to run certain popular mod packs (like Promods older versions) or to maintain compatibility with legacy save files. However, obtaining these keys requires an understanding of how the Steam platform handles game versions and licensing. Euro Truck Simulator 2 Version 1.35 1.31 Product Key
Version 1.31, released around mid-2018, was a stable and robust entry point. It introduced the ability to own and manage your own trailers—a massive gameplay shift that allowed players to take direct jobs from the cargo market rather than relying solely on freight market jobs. For players using a 1.31 key today, the experience is still enjoyable, but visually, it shows its age. The lighting is flatter, and the map detail, while good, lacks the depth of later iterations. The product key for Euro Truck Simulator 2
If you own the game, you do not need a new key to play version 1.31 or 1.35. You simply need to downgrade your installation via Steam. Version 1
The Downgrade Procedure: