In the game install directory you should have a Packages folder as shown here:
[img:9f09052447]http://img509.imageshack.us/img509/2307/20080831134242jt9.jpg[/img:9f09052447]
It's [b:9f09052447]NOT[/b:9f09052447] in your my documents folder path!
If you don't have that directory give someone here a holler and we'll help you out or try the links below and make your own folder.
If you are missing this folder and ASC_Face.upk you probably can't play the Aggressive Alleys maps.

http://relentlessterror.com/DOWNLOADS/ASC_Face.upk
http://relentlessterror.com/DOWNLOADS/Envy_DLC_Effects.upk
http://relentlessterror.com/DOWNLOADS/LT_Morbias.upk

The folder and files come from the UT3 Bonus Pack that had some new maps but nothing new for VCTF.  You can download and install the whole pack from here:
http://unrealtournament3.com/us/download/UT3BonusPack.exe
Epic's post about the bonus pack is here:
http://utforums.epicgames.com/showthread.php?t=608057