Since 2012, the game has been updated hundreds of times. The version from 12 years ago is missing features like rain sensors, advanced physics, and the massive map expansions (DLCs). The best way to get a working activation key today is:
The term "activation key 2012" typically refers to a legacy Retail Key. If you possess a legitimate key from 2012, the following scenarios apply: euro truck simulator 2 activation key 2012
Try every permutation.