For steps on “unhiding” iPhoto, see this support article on Apple’s website. If iPhoto doesn’t appear in the list of applications in the Purchases tab, it’s possible that iPhoto has been hidden from your purchases list.Your only options in this case are to revert to an earlier version of OS X that supports your version of iPhoto, or switch over to using the new Photos app (if you’re running OS X 10.10 Yosemite). If your Mac came with an earlier version of iPhoto, there is no way to download the latest version of iPhoto from the app store. Reinstalling will only work if your Mac shipped with iPhoto 9.0 or later, or you purchased iPhoto 9.0 or later from the Mac App Store.There are a few obstacles you may encounter when following these steps: If you wish to restore it, after iPhoto has finished installing, drag the iPhoto icon from the Applications folder to the dock to add it back in.
If you’ve installed OS X 10.10.3 with the new Photos app, that will have also removed the iPhoto icon from your dock.
IPHOTO FOR MAC OS INSTALL
IPHOTO FOR MAC OS UPDATE
Normally, it would be a simple matter of updating your version of iPhoto via the Mac App Store, but since Apple’s release of their new Photos app, iPhoto is now no longer available on the app store, which makes it impossible to directly update older versions of iPhoto. If this is the case, then trying to open libraries or perform other operations with iPhoto Library Manager will likely result in an error message saying that the installed version of iPhoto is not compatible. Certain versions of OS X enforce a minimum version of iPhoto that must be installed, and will refuse to run older versions.