Getting iPhoto in Yosemite and El Captian

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1. Go to the Apple Menu –> App Store
2. Head to the Purchases tab and sign in with your AppleID if you haven’t done so
3. See if iPhoto is in this list of previous purchases
4. If iPhoto is in the list, you may download it from here, by clicking on the install button
5. It may give you a warning about iPhoto being an earlier version–proceed to download anyway
6. Make sure all other users on your computer are logged out and not running iPhoto
7. This is a large download (a little over a gigabyte) so it’s going to take some time
8. It may ask that you update your iPhoto library to work with this version, which you would want to do
9. If iPhoto detects problems with your library, it will ask to repair it, which is also OK to perform