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The premise is mostly the same booting into Recovery mode to reinstall the system software.

If interested you can read how for macOS Mojave and High Sierra and Sierra. Newer MacOS releases also support the ability to re-install only macOS while leaving user files alone, however. Update: this article pertains specifically to reinstalling OS X on Macs, including El Capitan, Yosemite, and Mavericks.

If performed correctly as described, applications and user data will be preserved and not be modified at all, since this approach only reinstalls the operating system and system files. We’ll cover how to reinstall Mac OS X system software only with Recovery Mode, this reinstalls the most recently available version of OS X that is (or was) actively running on the Mac.