When you read the title, i do know how to fix it and if you have the same problem, then i know how you might be able to fix it.
After few updates at the past i have gotten notes about having a ,,unsupported game version,, every time update comes out.
after you download the update,you still get the itsact same notification. Yes,i also fell into confusion and wondered,am i ever able to play ETS2MP?
I watched one youtube video and i was advized to open steam and find ,,Euro truck simulator 2,,. Keep the arrow on the ,,Euro truck simulator title,, and right click it.
After you gave done tgat, move down and open ,,properties,,.. Click ,,Betas,, and you select a version of the game ETS2 recommends you to pick.
By it i mean that, after i tried to open up the game earlyer and got a notification, it advized me,which version i need to have,to open the game.
(for excample ,,Euro Truck Simulator 2v. 18.104.22.168s,,)