InvisibleRaptor

Hello @javiernox1

Please try the following:
 
1.) Login to Steam
2.) Right click on Euro Truck Simulator 2 and click on properties
3.) Navigate to the Betas tab and click on the drop-down arrow
4.) Choose(First one): NONE-Opt to leave of all beta programs
5.) Now wait for it to install and you will be ready to play!

If the solution above doesn't work, please try the next steps:

Step 1
Open Steam and go to your library -> games
Make a right click on Euro Truck Simulator 2 and open Properties
After the Properties window has opened click on Local Files tab and press Browse Local Files
A folder with game files will open. Remember the path to this folder

Step 2
Click Start -> Run (or WIN+R)
Type regedit and hit enter
Follow the path HKEY_LOCAL_MACHINE\SOFTWARE\TruckersMP
Look at the value parameter "InstallLocationETS2"?

Step 3
Copy the folder address from Step 1
Change the value parameter "InstallLocationETS2" (Insert the copied folder address)
Click OK.