A friend of mine purchased UT3 in a store, and said it came with some kind of custom content creation software. I purchased my copy through Steam and can't see it anywhere. Can someone help me out?

Edit: I just had a look on the Steam website and it says I should have it.

Toolset - Build your own levels, game types, and more, or download the latest mods from the massive Unreal community.
Edit: Nevermind! I did some Googling and found I needed to edit the desktop target.

"C:\Program Files\Steam\Steam.exe" -applaunch 13210 editor