DOWNLOAD IT FROM NOMUTANTSALLOWED.COM
You might still be able to get it from NMA(No Mutants Allowed). Last place I heard of it being available. ----Dopesmylez
It's still there:
Keep in mind that it doesn't contain any part of the original story, it's just to show off the engine. Also, keep in mind it's many years old, so the engine isn't as impressive as it once was.