Yes Amithlon was great. So great Amiga Inc pulled the license as it did a better job at an Amiga experience than anything they had in the works.
Problem is you need old Athlon hardware to use it. I've seen updates but UAE has gone through so many iterations that it's really rbust.
There's a guide out there on how to take a PC install a streamlined XP installation the boots into the UAE environment. That's teh closest you'll get to Amithlon without getting an old copy.