Download ((full)) Ets2 1.39 -

Released on November 3, 2020, version 1.39 introduced several major overhauls to the base game: ETS2 1.39 Update Release - SCS Software's blog

If you have the old DVD or a direct download from the SCS Software website: download ets2 1.39

1.40 and newer introduced a new lighting engine that is beautiful but notoriously heavy on performance.
1.39 keeps the older lighting engine. It runs smooth as butter on medium settings for most hardware and rarely crashes. It is widely considered one of the most stable builds SCS has ever released.