Before installing, ensure your hardware is compatible. High Sierra requires at least and 14.3GB of storage . It supports: iMac: Late 2009 or newer. MacBook: Late 2009 or newer. MacBook Pro/Air: Mid 2010 or newer. Apple Support Communityhttps://discussions.apple.com
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build download macos high sierra 1013 6 dmg file link
Open Safari and click this official macOS High Sierra App Store Link . Before installing, ensure your hardware is compatible
macOS High Sierra 10.13.6 full installer - Apple Communities download macos high sierra 1013 6 dmg file link