This map is built for UT2D Beta 0.9.7, which can be found here: http://utforums.epicgames.com/showthread.php?t=609762
To install you need to place these three files:
UT2D-Ducts_Beta1.ut3
UT2D-Ducts_Beta1_LOC_int.upk
Player Spawns are in the bottom corner, 1 on the pipe ledge and 1 in the top corner (on both sides of the map). Flags are in the bottom corners.