You can find the most up-to-date content and official builds on the SCS Software Blog or the official Steam Page must-have map DLCs currently available? American Truck Simulator Version history
You will need to disable automatic updates in the game launcher. The 1.33.2 patch is included in the "Gold" retail release that bundles the first 15 DLCs. You will need to add Oregon, Texas, and Kansas manually.
: For the first time, players could own and customize Turnpike Double trailers (up to 100 ft long) trucksimulator.wiki.gg