OS X El Capitan: Reinstall apps that came with your Mac
If you delete an app, you can reinstall it.
To reinstall an app that came with OS X (such as Mail or Calendar), reinstall OS X.
Reinstalling OS X doesn’t erase your information.
To reinstall iTunes, download it from Apple Downloads.
To reinstall Pages, Numbers, Keynote, iMovie, or GarageBand, use the Mac App Store.
If the apps came on a disc, use the disc to reinstall them instead of the Mac App Store.
Last Modified: Apr 13, 2016