To download or revert to American Truck Simulator (ATS) version 1.39 , the most reliable and official method is through the Steam Library
: Improved cabin spatial mixing and a new Turbo sound slider were added to give players better control over interior engine noises. american truck simulator 1.39 download
: Steam will automatically download the necessary files to revert your game to version 1.39. System Requirements To download or revert to American Truck Simulator
: Introduced the customizable turbo volume slider and improved cabin spatial audio mixing. american truck simulator 1.39 download
: The game's start-up screen was overhauled, allowing players to access and change game options (like graphics and sound) before even loading their profile. Sound Improvements