Hammer1055

Follow this Guide
 
1. open steam
 
2. right click ATS/ETS2 and go to properties 
 
3. hit the tab that says "BETAS"
 
4. hit the drop down menu that says "opt out of betas" and change it to 1.2.x
 
5. wait for it to update and launch MP
 
Done.
 
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or
you can wait for the mod update to come out soon enough and play Arizona thats  what i'm doing because i'm lazy.