Like already said, does not work on Mac. I exclusively own macs, but I have windows partitions on as well. If you can get your hands on a copy of windows XP, it's easy to install with Bootcamp on Mac. But I would not do it unless, like me, you have other programs you need that don't come in Mac versions. To be honest the E-trac Xchange is just a gimmick. I have never even hooked my Etrac up to my computer, though I have the software installed.
Failing to read everyone's reply, perhaps it was mentioned, one of the most useful things you can do is buy Andy Sabisch's book on Getting the Most out of your Minelab Explorer and Etrac. That said, I like personally to run in Multi-tone (30 or 29 what ever the max is) on conduct, Deep recovery on, Trash off unless I need it, Difficult Soil, Usually Manual sens, And I set my pattern in the smart find screen to reject anything below CO-10 and anything higher than FE-24 or 27 (depending on how charitable I feel). I am afraid the preset coins program will miss things; I know with my setting I wont be digging any 3 -cent nickels, but they are rare around here where I am. These are just settings that work really well for me, in my soil, where I hunt. Experimentation is good. Also get Andy's book.
BTW, learn to trust the audio, and learn to analyze a target not just by tone, pitch, volume, quality, etc but also by what the threshold does...
-Good luck!