Scania Truck Driving Simulator 1.6.1 Activation Key |link|

(including version 1.6.1), the only way to get a valid, working activation key is through an official purchase. How to Get an Official Activation Key

If you already bought a legitimate activation key but the game refuses to accept it, try these troubleshooting steps: Scania Truck Driving Simulator 1.6.1 Activation Key