I am using aperture 2.1.1. I downloaded the update 2.1.3, but when I try to install it an error box pops up and states I need to have Aperture 2.x or greater and does NOT install. Any suggestions??
In my case the fix worked. In an effort to have the illusion of organization I had put Aperture.app in a 'Aperture 2' folder. It needs to be loose in the Applications folder.