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I have an iMac from before 2012 (mid-2011)... OS Sierra 10.12.6. I'm trying to upgrade to High Sierra 10.13.6 but I get alert saying "This update requires macOS version 10.13." How do I update it to macOS version 10.13? I don't see anything in app store.
Thanks
iMac 21.5″, macOS 10.12
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Only the full installer necessary for an upgrade to High Sierra can be found at the link provided by dialabrain. The partial macOS installers from Apple's download site only work on the existing major version of the currently installed operating system.
Old iMac before 2012 upgrade to MacOS High Sierra (10.13.6)
