Can I upgrade from 10.11.6 to 10.13
Can I upgrade from 10.11.6 to 10.13
iMac 21.5", OS X 10.11
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Back up your data, check your applications for compatibility, and depending on which Mac model you have, download High Sierra or Catalina from the Mac App Store.
For reference, the earliest 21.5-inch iMac is a late 2009 model; earlier iMacs can't run Sierra or above.
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