Today I've installed El Capitan on all of my Macs (they were still on Mavericks). It works flawlessly, but I can't use Aperture anymore ! No problem for iPhoto, I disinstalled it, but all my photo library is in Aperture and it doesn't work with OS X 10.11 App Store tell me there is an update available for Aperture, but if I try to install it, I receive an error message saying "Not available. Try later". Im a little bit worried. Thousands of photos in it.