It sounds like you might have a corrupted zip. Could you try downloading and trying again? You might also want to try an alternative compression program, I've had success with Unarchiver before (free).
Hi Chris. When trying to access 'Unarchiver' it locked up my MAC. I still have the fp_10.0 install in the trash and running the uninstaller twice did not remove it; whould taking out the trash remove it? I don't want to redownload the 10.3 archive version yet as it took a long time to download.