Ah, that was exactly it. I had the program in one folder too many.

It's up and running now.
Thank you so much for your time and patience.

I have one final question (I think, I hope).
As I noted earlier, I need to use the program to make use of its .smd import capability. I'm almost 100% positive that Sims 3 doesn't have the model root, material root, and bin dir directories that the pathing step is looking for. Can I still use the program to import .smd files without setting those folders up first?