This texture pack was created to work with my Perfected Doom 3 mod. Using it with other mods may cause problems. Just drop the pak file into your Perfected Doom 3 mod folder and you should be good to go.
Just to let you guys know, I am working on another small patch for Perfected Doom 3 that will add a few more fixes and enhancements to the mod. I'll update on that ASAP.
Enjoy the texture pack.