This is not a steam version ! This is a DRM-free version.
Log into your GOG account, or create one first.
Visit the following page : https://www.gog.com/#giveaway
Scroll down to see a green button with the Postal 2 banner that says “Get it Free”
You now get Postal 2 added to your library.
POSTAL: Classic and Uncut free permanently :
https://www.gog.com/game/postal_classic_and_uncut
Click Add to cart and then check out.
