American.truck.simulator.v1.46.2.11s.part2.rar -

Ensure you have all parts (part1, part2, etc.) in the same folder.

Check the in-game version number in the bottom corner of the profile selection screen to ensure it matches 1.46.2.11s . Technical Notes American.Truck.Simulator.v1.46.2.11s.part2.rar

Open the resulting folder and run setup.exe or the game executable. Ensure you have all parts (part1, part2, etc