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Use the createinstallmedia tool again, but this time point it to the newly created volume (which is likely named untitled ) instead of a USB drive.

Open Terminal and use the following command to fetch the installer directly from Apple's servers: softwareupdate --fetch-full-installer --full-installer-version 10.13.6 . download macos high sierra 1013 iso and dmg upd

These are often pre-patched or converted files designed to bypass the hardware checks found in standard Apple installers. Use the createinstallmedia tool again, but this time

The macOS High Sierra 10.13 DMG file is not officially available for download from Apple either. However, you can download the macOS High Sierra 10.13 installer from the Mac App Store and then create a DMG file from it. Here's how: Use the createinstallmedia tool again

Download macOS High Sierra 10.13 ISO and DMG: Complete Guide (2026 Edition)