How to restore your Mac to an older version of OS X

Don't want to install El Capitan on a Mac you're restoring? Here's how you can install an older OS.

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Glenn Fleishman is the author of dozens of books. His most recent, updated for iOS 14, iPadOS 14, and Big Sur, are Take Control of iOS and iPadOS Privacy and Security, Take Control of Your Apple ID, Second Edition, and Take Control of Wireless Networking and Security. He’s a senior contributor to Macworld, where he writes Mac 911.
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