I just had a look at the website, and also RetroArch, RA does not have a core for Apple, which is unusual so it must be a hard system to emulate.
As for the website, all of that went over my head it looks a lot of hassle just to load up a game, I shall do some more digging as I am just sat here waiting till sleep time.
I just checked my hard drives and I have near enough every rom set under the sun, but nothing for Apple, I have BBC, I have Electron I have all sorts of weird old computers, just not the Apple.
Regards
Mark