Version 1.15.1 is an older legacy update released in . "Product key" searches for specific old versions are often used as bait by malicious sites to trick users into downloading "key generators" or "activators" that contain:
version 1.15.1 represents a classic era of the simulation. Released in late 2014, this "Holiday Update" brought festive cheer and significant technical improvements that paved the way for the massive world we drive in today. SCS Software's blog What Was New in Version 1.15.1? Euro Truck Simulator 2 1.15.1 Product Key
Depending on where you bought the game, your key is located in one of the following places: Version 1