Server-side instructions

As you can see there are two predefined mods in the mods menu. To make it work on the clients, you need:

1) Make sure you and client players have been subsribed to DarkFire and ProjectMarica

2) Open ...Steam\steamapps\common\POSTAL2Complete\WorkshopContent\737631813
Open Postal2CoOp.ini

3) Find there [Engine.GameEngine]
Add the following lines:

ServerPackages=DarkFire
ServerPackages=DarkFireFX
ServerPackages=DarkFireSteam
ServerPackages=ProjectMaricaCore
ServerPackages=ProjectMarica
ServerPackages=ProjectMaricaSteam
ServerPackages=ProjectMaricaSteamCase
ServerPackages=Gallardo
ServerPackages=MaricaCinemaTools
ServerPackages=MaricaDragon
ServerPackages=MaricaQuad
ServerPackages=MaricaRigCar
ServerPackages=MaricaSanchez
ServerPackages=MaricaSegway
ServerPackages=MaricaSilverDragonCars
ServerPackages=MaricaSnowMobile
ServerPackages=MaricaSpaceFighters
ServerPackages=MaricaSpaceShip

This is only way to use inventory mods, such as guns, items.

1) Open ...Steam\steamapps\common\POSTAL2Complete\WorkshopContent\737631813
Open NicksCoopCustomMods.ini

2) Find there [NicksCoop.CoopBrowserModsListCW]
Add the following lines:

CoopMods=(ModName="Your mod",InventoryClasses=("ModPack.GunWeapon","ModPack.RifleWeapon"))

Where ModPack is an example of script package of the mod, GunWeapon or RifleWeapon is an example of weapon/item class.

3) Copy the NicksCoopCustomMods.ini into ...Steam\steamapps\common\POSTAL2Complete\System

4) Open Postal2CoOp.ini
Find there [Engine.GameEngine]
Add the following lines:

ServerPackages=ModPack

Where ModPack is an example of script package of the mod.