Hello, as the replies above, you need to follow what the knowledge-base article says to downgrade your game to the latest official 1.36.2.55s version. Moreover, the profile saved in 1.37 cannot be used in 1.36, so If you did not back up your profile(s), head to your Document\Euro Truck Simulator 2 folder and find the profiles(1.37.0.65s).bak folder. After replace the all the items to those in your current profile folder, your backup profile is back for you to use in 1.36 and truckersmp.
Regards,
Edmund