If you specifically need version 1.45 because your favorite mods have not been updated for the newest game versions, you can legally downgrade your copy of the game using Steam's "Betas" feature.
From the dropdown menu, select temporary_1_45 - 1.45.x for incompatible mods or a similar version tag.
: Multiplayer sessions now support missing modifications, allowing you to join a friend’s convoy even if you don't have every mod they are using. Downloading the 1.45 Update Euro Truck Simulator 2 1.45 Download
A: Wait for mod updates or roll back to 1.44 (Steam → Properties → Betas → "temporary_1_44").
Check out these overviews of the 1.45 update features and gameplay: Euro Truck Simulator 2: 1.45 Update Changelog Video 273K views · 3 years ago YouTube · SCS Software If you specifically need version 1
If you are opted into a beta branch (like 1.44 or Open Beta), you must opt out. Go to Properties > Betas and select "None."
A notification popped up in the top left corner, in the standard font: CARGO: SILENCE. MASS: 0 KG. REWARD: N/A. Downloading the 1
To help you get the most out of your 1.45 experience, I can help you with a few more things: