This is usually caused by incompatible mods from newer versions. Clear out your Documents/Euro Truck Simulator 2/mod folder before launching 1.31.
Beyond the headline features, update 1.31 included numerous quality-of-life improvements and behind-the-scenes fixes. euro truck simulator 2 version 1.31 download
The official update for Euro Truck Simulator 2 (ETS2) version 1.31 This is usually caused by incompatible mods from
One of the biggest reasons players download version 1.31 is to use legendary map mods and truck packs that were never updated for modern versions of ETS2. The official update for Euro Truck Simulator 2
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