Official product keys for Euro Truck Simulator 2 (ETS2) are only available through authorized purchases. There is no legitimate "exclusive" product key for version 1.40.4.8 provided for free or through non-official channels. Official Methods to Get a Product Key
Be cautious of websites offering "exclusive" or "100% working" product key lists for free. These keys are often: EURO TRUCK SIMULATOR 2 PRODUCT KEY euro truck simulator 2 product key version 14048 exclusive
To prevent Steam from silently updating you to a newer version: Official product keys for Euro Truck Simulator 2
Here’s the straightforward guide: