TAUCP comes as an executable installer. Run the installer and let it install to the default location (probably c:\cavedog\totala).
Next, open Windows Explorer and go to that location. Copy all the installed files (which will include a whole bunch of folders, ai, gamedata, maps, etc.)
Go to C:\Program files (x86)\Steam\steamapps\common\Total Annihilation\ and copy the files into there.
I got one prompt, which was to overwrite rev31.gp3, and allowed this to overwrite. This file enables the mod.
Now, when you launch Total Annihilation, the new mod kit should be active with new units in various factories.
- It also creates a file prefrontend.exe in the install directory which allows you to configure the mods and AIs.
- rev31.gp3 is the patch file that enables TAUCP. If you don’t copy, it won’t work. The prefrontend.exe file swaps the original and modified rev31.gp3 file as you enable the mod.