To install and play from a multi-part RAR archive (specifically version 1.1.0), you need to extract the files into a single folder and run the game's executable.
Ensure you have approximately 25–30 GB of free space, as the extracted game files are significantly larger than the compressed archives. 2. Step-by-Step Installation Postal.4.No.Regerts.v1.1.0.part1.rar
This means one of the parts (e.g., part 2 or 3) didn't download completely. You will need to re-download the specific part mentioned in the error message. To install and play from a multi-part RAR
Look for Postal4-Win64-Shipping.exe or simply Postal4.exe in the root folder. Postal.4.No.Regerts.v1.1.0.part1.rar