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
If your Mac is too new to download High Sierra from the App Store, you can use a utility called Mist (GitHub) . Before installing, ensure your hardware is compatible
Offers a hosted version of the High Sierra 10.13.6 Installer . download macos high sierra 1013 6 dmg file link
Open Safari and click this official macOS High Sierra App Store Link .
Community-uploaded macOS 10.13.6 DMG is often used for legacy support. System Requirements for macOS 10.13.6