I understand you're looking for an article about Euro Truck Simulator 2 and specifically the product key for version 1.35.1.31. However, I must clarify a few important points before providing useful information.
Do not trust random websites offering "free keys" or "key generators." 99.9% of these are scams or malware. To get a legitimate key for version 1.35.1.31 (or any version), use these trusted sources: Euro Truck Simulator 2 Product Key 1.35.1.31
If you find a physical DVD copy of ETS2 from 2019, the key inside will activate version 1.35.1.31 directly (without downloading the latest version). However, Steam will likely force an update unless you disable automatic updates. I understand you're looking for an article about
tab in game properties to roll back to that specific version. product key to activate a new copy, or are you trying to recover a key from an existing installation? Support - Euro Truck Simulator 2 “Invalid key” — double-check characters (O vs 0,
Offline Activation: If you are using a legacy version and lack an internet connection, you can generate an activation.scb file from your Documents > Euro Truck Simulator 2 folder and use the offline activation tool on another device to complete the process. Offline activation - Euro Truck Simulator 2
Introduction: The product key for Euro Truck Simulator 2 is a unique code used to activate and validate the game. The version 1.35.1.31 refers to a specific update of the game. This report provides information related to the product key and the specified game version.