I can down load any viewer just fine. But when I try to launch it it acts as if I never clicked on it. I have tried re-downloading them many times. I have tried viewer 2, Phenix the most. I have... Mac OSX Version 10.4.11 Processor 2 GHz Intel Core Duo Memory 512 MB 667 MHz Ram Graphics ATI Radeon X1600 ??? I think?