If you need to back up your saves or move them, they are typically found in the LocalLow folder within your Windows AppData directory (PCGamingWiki).
If the game starts in the wrong language, GOG users can find a Language_setup.exe in the game's root directory to manually change it. postal-brain-damaged-installation-tutorial
Select the game in "Owned games" and click Install . If you need to back up your saves
This is a fast-paced shooter. Constant movement is key to surviving the aggressive enemy AI in the later levels. postal-brain-damaged-installation-tutorial
Choose your installation drive and wait for the download to finish. Click to launch the game. Option 2: GOG (DRM-Free)