their various shareware versions, or have your own free WAD files you want to run. Thislistgives the instructions for installationandsome links to free maps that are great to play with the mod, if you don't have
The base mod requires the asset pack, while Mixer unlocks all factions in Realms of Chaos and Immortal Empires campaigns (although it doesn’t work in multiplayer). If you’ve played through all your desired campaigns and can’t wait until the next DLC, this should be right up your alley...