Latest update 1.14.x (Steam only for while) have support to 64 bits adding the command line -64bit. I tried play the game but show this error in game.log: 00:00:02.248 : loading 'FanaLEDsPluginETS2' 'C:/Program Files (x86)/Steam/steamapps/common/Euro Truck Simulator 2/bin/win_x64/plugins/FanaLEDsPlu...