Euro.truck.simulator.2.west.balkans-rune -

This is known as "DLC unlocking." In fact, RUNE often releases updates that specifically act as "creators" for legitimate Steam copies, allowing legal base game owners to play stolen DLC.

If you're a fan of Euro Truck Simulator 2 or just looking for a new trucking simulation experience, the West Balkans expansion and RUNE patch are a great combination to explore. Euro.Truck.Simulator.2.West.Balkans-RUNE