I clicked the "donate" button on his page to shoot him some $$ after using the demo to be able to grab the screenshots from Operation Vietnam and a quick story about how I loved his work, IIRC. He emailed me back with a registration key. (FWIW, I sent something like $20 and registration was like $5, but I really didn't have much interest in actually registering since I didn't really intend to use it again)
Never really had a need for it because I only had a C2D 2.4ghz, which was totally too weak to handle DS emulation. :(
A viable alternative is desmume, I think. Just fired it up and played a little of Order of Ecclesia...seemed to work pretty damn well at window size 2x.