This may seem trivial but...

I downloaded the umod and installed it. At first it seemed fine then I noticed on all the screen shots there is a very diferent HUD did I miss something mine didn't change from the standard Unreal HUD.

It depends which game mode you were in. Deathmatch's HUD doesn't differ much from the original (just the ammo clip count), but if you were in Classic or Standoff, and it still looks like the Unreal HUD, try hitting F5 a few times and see if the Infiltration HUD appears.