Click on the Betas tab on the left-side menu.

Recommended (approximate):

To run version 1.39 smoothly, your PC should meet these standard requirements: ETS2 1.39 Update Release

The 1.39 update for Euro Truck Simulator 2 (ETS2) , released in November 2020, introduced major gameplay overhauls including ownable low-bed trailers and a complete visual reskin of the city of Calais Key Features of Update 1.39 Low-Bed & Low-Loader Trailers:

Whether you want the nostalgic physics, the specific sound pack, or you simply can't run the modern lighting, version 1.39 remains a high-performance, stable trucking paradise.

Download Euro Truck Simulator 2 1.39: The Ultimate Modding and Map Guide

Look for specialized engine sound mods that complement the 1.39 sound engine updates.