If its not showing up ingame as custom gametype, then it's most likely not properly installed. Did you
really made sure you installed each file in the right folder?
Just unzipping into the ut2004 root directory doesn't work. Each file needs to be placed into their own folder like Static Meshes, Textures, System, etc. It's all explained in the readmefile that comes with the zip archieve.
I remember from the ut99 days that some mod(s) (dont remember what mod it was) installed the same ut root structure inside the actuall ut structure itself.. and it was quite confusing sometimes. Dunno if this still happens, but i haven't seen one doing it in ut2003-4.
Check if its not installed somewere else by mistake.
A tip: re-install each file manually from the zip archieve instead of using the extract feature.. may that solve the problem.. If still nothing, then post step by step of what you are doing.. as parser said.
(You didn't had any UT or (self)Server running at the time you installed this mod did ya? I hope not.. coz i have met real stupid ppl with similar problems as you... the only thing was.. they forgot to close down any running UT or (self)Server / ini before installing something new and shouting out its not there or does not work. LOL!

)
g/l
