Posted here. :)

Download the patch 1409X from The Patches Scrolls
List of changes in 1409X
Patch 1409X contains all of the following Postal 2 mods, with many improvements, additions and updates.
Xadmin 202
Zounds
Zeroping
X characters
AW weapons
Holy Wars Gametype (now known as Jihad)
Arena Gametype
King of the Hill Gametype
STPExtras And STPExtrastoo (editor tools)
Also minor mods like No rockets/shovel fight can all be done within 1409X. These mods are are no longer needed and are now obsolete. Don’t try and run any of these mods with 1409X. If you have maps that have AW weapons or something else from the above built into them, you should remake them with the 1409X versions (Any Map using features from 1409X should have the [X] tag on the end).

I wonder if Gog will ever update the installer to include this patch.