How to reinstall Apple macOS – TechRadar

You can use macOS Recovery to reinstall macOS at any time on your Mac. How you start reinstalling the operating system will depend on which type of Mac you own. 
Macs going back nearly 15 years use Intel-based chips. Meanwhile, the 24-inch iMac (2021), 13-inch MacBook Pro (M1, 2020), MacBook Air (M1, 2020), and Mac mini (M1, 2020) run Apple silicon.
Regardless of your Mac version, the following instructions will reinstall the current macOS version onto your Mac. If you want to reinstall the version…

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