I updated to OS X months ago and have had no issues using aperture.  I was also running the most recent version of Aperture on my Mac.   I copied some of my libraries to my back up hard drive yesterday with no issues.  I opened a few of my backups on the hard drive and received the prompts to update to newer version of Aperture which I did.  This morning when I went to open Aperture and looked at each of my Aperture Libraries in the Pictures folder they were there but showed a picture of an empty page with corner folded.  When I click on Aperture now on my Mac it has a line crossed through it and says “You can’t open the application Aperture because it is not supported on this type of Mac.”  I tried opening my back up libraries on the hard drive and they all show the same picture of the empty page as well.