Avoid any download labeled "ETS2 v1.5 free." It is almost certainly a virus, a fake file, or a broken 10-year-old build that will crash on Windows 10/11. If you cannot pay $5, play the official demo instead.
It's important to clarify that available from official sources (Steam, Epic Games, or the developer SCS Software). Euro Truck Simulator 2 PC Download gratis -v1.5...