The correct way to is via Steam's Beta system . As long as you own the base game on Steam, you can legally download any previous version.

With ETS2 1.31, players can look forward to a more engaging and immersive experience. Here are some of the aspects you might enjoy:

At least 25 GB of available space is required on your Steam Drive .

Version 1.31 introduced several significant mechanics that are still core to the game today: