how do i upgrade my computer
how do i update my computer
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That depends greatly on the particular computer.
Different computers have different options and upgrade paths available.
Details and download links for most of the recent OS X and macOS versions:
How to get old versions of macOS - Apple Support
How to upgrade to macOS Big Sur - Apple Support
Or tell us which computer you are seeking to upgrade, and we can provide tailored suggestions. For a Mac, look at 🍎 > About This Mac in the menus, and post the Mac model and year shown there, and post the version of OS X or macOS the computer is already running.
Have a backup created prior to the upgrade.