Hello @[+381] - VojvodA,
I Had two ideas to Help you.
First Idea you Check your Game for Missing Files, Make a right click on Euro Truck Simulator 2 and open properties. After than Go to the Local Files and click on To verify Game Files.
Or when the First Idea isn't Working then try this Out, select the temporary 1.48.5 Version but when Steam is starting an Download you select none temporary Version than should the new Version are updating.
I Hope i can Help you.
Kind regards,
Julian German
RSL Human Resources