This is the first version of DWT, and the one submitted to map labs. THIS WAS SUBMITTED TO MODDB AFTER THE MAPLABS SUBMISSION!
You will need Mapbase to use this mod/map. Instructions on installing it along with the Source SDK Base are on that page.
Once mapbase is installed, drag tt12_imtired.bsp to your maps directory in the mapbase folder. Then, open your in-game console (you will need to set it on first under the advanced section of the keyboard settings ingame) and type "map tt12_imtired" without the parentheses.