Go to the sourceforge files section.

Also try out Darren Winter's add-on called 3ddeskfx. Here is a description:

3D-Desktop FX is an add-on for 3D-Desktop that includes shortcuts to start and stop 3D-Desktop, adds in several new view settings (updated 3ddesktop.conf) and inludes a new script (3ddeskfx) that allows you to call all of the old and new views, including the ability to have a random mode or view each time you launch!

Here is a patch against fluxbox 0.1.14 that allows 3ddesktop to work with fluxbox.

There are some old files here. And for more info here is the README and the ChangeLog.