If you purchased iLife on a disc or your Mac came with DVDs, insert the Applications DVD or Mac OS X Install Disc 2 and install iPhoto performing a custom install. Then, open > Software Update, and install the latest version.
If you purchased iPhoto in the Mac App Store, the most recent version isn't compatible with your Mac OS X version, so you will have to upgrade OS X if you want to install iPhoto from the App Store
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