To install the program on the Mac hard drive just drag it from the USB to your main hard drive , I believe that should work and the installer should be moved along with it if you are then going to be operating and maintaining the program on the main drive. Or are you trying to maintain a back up file?

As to part 2 - I guess using "get info" to check the date the files were created. I'm only aware of one update on the real tracks which was for those who are updating BIAB 2009 , if you have BIAB 2009.5 shouldn't all your tracks be current?