iMac (21.5-inch, Mid 2011) how-to update OS El Capitan 10.11.6 to High Sierra
Does Apple offer an upgrade to High Sierra for this computer model?
iMac 21.5″, OS X 10.11
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iMac (21.5-inch, Mid 2011) how-to update OS El Capitan 10.11.6 to High Sierra