I didn't put a folder inside the zip because I was afraid of creating too much subfolders when extracting (if you use WinXP extraction tool, that will happen).
So, you must create a folder named MOD inside CustomModels folder and then copy model1.jpg and model1.3ds (wich were in the .zip you downloaded) to that location.
Hope this helps.
Btw, this level is very tricky, especially the part when the z-bot/UFO walks in circles in small 2x2 squares. You need VERY FAST

fingers to avoid getting blasted. Good luck.
