If you go to Steve's home site and search for "Stencil Maker", I'm sure that is still in there some place. I tried a quick look and couldn't find it right away but, I didn't do a search either.
I've used it quite a bit and it takes some learning right at first but, once you figure it out, it works great!
Just keep looking, it has been a few years since he made it.
Rog