Assuming you have a legitimate key from a physical purchase or an old Humble Bundle, here is how you used to activate it (for historical accuracy):
Yes. Every Steam key for ETS2 unlocks all versions. Use the Beta tab in Steam properties to downgrade to 1.15.1 specifically. Euro Truck Simulator 2 1-15 1 Activation Key
To understand this keyword, we must decode it: Assuming you have a legitimate key from a
If automatic activation fails, you can find a file named activation.scb in your Documents/Euro Truck Simulator 2 folder. This file can be uploaded to the Official Activation Page to generate a manual unlock code. Key Features of Version 1.15.1 To understand this keyword, we must decode it:
The legacy version will prompt for an activation key upon startup. Enter the Key: Carefully type your 25-character legacy key.
No separate activation key is required.
If you purchased the digital edition directly from the Official ETS2 Website , your product key was sent to your registered email.