Before downloading the installer, ensure your Mac hardware is fully compatible with macOS 10.13.6. Supported Mac Models Late 2009 or newer MacBook Air: Late 2010 or newer MacBook Pro: Mid 2010 or newer Mac mini: Mid 2010 or newer iMac: Late 2009 or newer Mac Pro: Mid 2010 or newer Minimum Hardware Requirements
Execute the following commands sequentially to create a blank disk image, mount it, write the installer data, and convert it to a DMG: macos high sierra 10136 dmg
Once completed, the file "Install macOS High Sierra.app" will appear in your folder. Method 2: Using the macOS Terminal Before downloading the installer, ensure your Mac hardware