Once you have the installer in your Applications folder, you can create a bootable USB drive (at least 8GB-16GB required). Microsoft Community Hub Format the Drive: Disk Utility to format your USB as Mac OS Extended (Journaled) and name it Terminal Command: Run this command to create the media:

: If you already have High Sierra and just need the 10.13.6 patch, use the macOS High Sierra 10.13.6 Update Combo Update How to download and install macOS - Apple Support

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