Alternatively, you could just download the zip file attached to the first post in this forum thread:
http://forum.thegamecreators.com/?m=forum_view&t=147790&b=10
3D Gamemaker was made in DB Classic (if I remember correctly), so you can choose to place the d3drm.dll in either the approrpiate Windows sytsem folder, or in the same folder as the 3d gamemaker's EXE.
Any games you make (as standalone exe's) will need this dll as well, so if you ever need to run it on another computer you'll have to include a copy of the d3drm.dll in the same folder as the game exe.
"I wish I was a spaceman, the fastest guy alive. I'd fly you round the universe, in Fireball XL5..."