I agree with Mcgroar, install 1.05 if you can and skip 2.0, 2.0 is absolute garbage, one of the worst Mac applications I've ever seen. After I used it for a few days, it crashed, and then I could not restart the app without it immediately crashing ever again, even after restarting, unplugging the RadioSHARK hardware, etc. Fortunately I had a disk image of the old 1.05 software, so I reinstalled that and it's working great under Tiger 10.4.3. Much better interface than 2.0, and you can record without having the app open. Griffin should be ashamed of the 2.0 software, it is truly awful. I don't know if they lost some developers or something, that's definitely what it feels like to me. Not even sure what the whole point of a 2.0 version was in the first place, it doesn't seem to do anything that 1.05 doesn't and is worst in every way. Thus, my four stars are for the 1.05 version, not 2.0.