The Mac OS 10.8 App Store would ONLY download the 19MB High Sierra Installer AGAIN. A journey of a thousand miles begins with a single step. The OS cannot be installed or booted for the unsupported version. Booted newly installed Mac OS X 10.8 and opened App Store (App Store still works fine just a little slow rendering images). A list of compatible macOS (OS X) versions is posted for each Mac model. This comes to support Apple’s credo that any device made more than 7 years ago is too old and obsolete to support the newer capabilities in software development. Erased the Internal SSD drive with Disk Utility and Installed Mac OS X 10.8 fresh. In short, any Mac from 2009 or newer has the configuration to support macOS 10.13 High Sierra.
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