MacOS
I am using MacOS 10.12. How do I upgrade to MacOS 10.13
iMac 21.5″, macOS 10.12
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You can find the installer here:
macappstores://apps.apple.com/app/macos-high-sierra/id1246284741?mt=12
(paste the URL into your address bar).
Whether you can install it will depend on whether your Mac is compatible.
BACK UP FIRST!!