macOS High Sierra 10.13.6 is the final and most stable version of the High Sierra operating system. Released in July 2018, it focuses on massive "under-the-hood" performance upgrades rather than radical visual changes, making it a "refinement" update similar to what Snow Leopard was to Leopard.
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Ensure your hardware is compatible before attempting the installation: Minimum Requirement Memory (RAM) 2GB minimum (8GB recommended) 14.3GB available for upgrade Late 2009 or newer MacBook Pro/Air Mid/Late 2010 or newer Late 2009 or newer Mid 2010 or newer 4. Key Features & Updates macos high sierra 10136 dmg high quality