The , typical of older boxed copies, uses a key format of five groups of five characters (XXXXX-XXXXX-XXXXX-XXXXX-XXXXX). The newer Steam edition , which is the standard version today, uses a shorter format of three groups of five characters (XXXXX-XXXXX-XXXXX).

: Expanded trailer options, including ownable logging and container trailers. Euro Truck Simulator 2 Version history

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.