http://ducttape.glenmurphy.com/
It works for me and all I did was follow the instructions found in the readme:
- INSTALLATION --------------------------------------------
Doom 1.3 Installation Instructions:
Unpack, copy the pak008.pk4 to your /base directory, and run
Doom3. Note that if you have any save games, loading them will
make them start at the beginning of the level. If you remove
duct-tape, then they will start at whereever they were before.
Doom Resurrection of Evil Installation Instructions:
Unpack, copy pak002.pk4 to the appropriate directory (I'm not
quite sure what it is as I don't have it). Are you sure you're putting it in the *base* folder inside of the directory where you installed Doom 3 to? It should be inside of a folder with only pk4 files and nothing other than those.
Also, make sure you are not putting it in /home/you/.doom3/base but in the actual install directory (default is */usr/local/games/doom3/base* although I install games to my home directory because there are less permission problems and I can back up my installs). Also, rename it to pak009.pk4 because pak008.pk4 is already taken by the game (perhaps it's from an update that wasn't out when he wrote the instructions).