If you are installing High Sierra on an older third-party solid-state drive, the installer might fail when trying to convert the drive from HFS+ to APFS. Ensure your SSD firmware is up to date, or use Disk Utility to manually pre-format the target drive to APFS before running the OS installer.
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Once you have downloaded the DMG, you have two primary options: creating a bootable USB drive (clean install) or running the installer directly (upgrade). Method 1: Clean Install via Bootable USB (Recommended) If you are installing High Sierra on an
Follow the prompts to install the Install macOS High Sierra.app into the /Applications folder. Run the application from Applications to start the update. Troubleshooting & Common Issues Once you have downloaded the DMG, you have
For those interested in downloading and installing macOS High Sierra 10.13, the following resources are available: