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The macOS High Sierra 10.13.6 Update improves the security and stability of your Mac, and is recommended for all users.
Just substitute whichever OS you're looking at upgrading to and replace "OS 11.1 Big Sur" with the OS you want to install. Or you can phone Apple help and speak to someone about it directly. Good luck, hope this helps.
Download and install current or previous versions of the Mac operating system on compatible Mac computers. To maintain your computer's security, stability, and compatibility, Apple recommends using the latest macOS that is compatible with your Mac. macOS updates and upgrades also include the latest features and built-in apps such as Safari.
About the macOS High Sierra 10.13.6 UpdateThis update is recommended for all macOS High Sierra users.The macOS High Sierra 10.13.6 Update adds AirPlay 2 mult...
Run the 10.13.6 Combo update if running an earlier version of 10.13 and desiring those security enhancements. Be forewarned, Macs with solid state drives will be updated in formatting to APFS with 10.13 or later (this is discussed later in the tip, but bears repeating).
How to install the macOS High Sierra 10.13.6 update. Before updating, perform a backup of you Mac. Then follow the steps below. 1.
Use About this Mac from the Apple Icon on Desktop - the required Information will be there. With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install.