Because American Truck Simulator frequently updates (with the latest being as of early 2026), players specifically seeking version 1.39 often need to use Steam's versioning tools to "downgrade" or maintain that specific build for mod compatibility.
: The main launch screen was rebuilt for better accessibility, placing the DLC Browser, Mod Manager, and Profile Manager together. It also introduced a new Game Options feature, allowing players to adjust settings before even loading into their truck. american truck simulator 139 download new
: Once selected, Steam will automatically begin downloading the 1.39 files. System Requirements and Mod Compatibility American Truck Simulator Version history : Once selected, Steam will automatically begin downloading
: Right-click the game title and select Properties . Select Betas : Go to the Betas tab in the properties menu. : From the drop-down menu, select the branch
: From the drop-down menu, select the branch labeled "temporary_1_39 - 1.39 for incompatible mods" or a similar legacy version.
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