(ATS) was a significant milestone that introduced a new launchpad, redesigned lowboy trailers, and various UI improvements. While the game has since moved to much newer versions, you can still access 1.39 through Steam's beta settings to ensure compatibility with older mods or specific map saves. Key Features of Version 1.39

Steam will automatically begin downloading the version 1.39 files. Key Features of Version 1.39

: Select Properties , then navigate to the Betas tab.

Released in late 2020, version 1.39 introduced several major overhauls: Launchpad UI

was added to the dealership roster in December 2020, shortly after the initial 1.39 launch. Cabin Accessories DLC

| Feature | ATS 1.39 | ATS 1.48+ | | :--- | :--- | :--- | | | Full support | Full support | | Texas DLC | Not compatible | Full support | | Convoy MP | No (Beta backend only) | Yes (Full sync) | | Lowboy Trailers | Yes (First version) | Yes (Improved) | | Lighting System | Classic pre-1.40 | New calc. & skyboxes | | Mod Stability | High for old mods | Low for old mods |