If you specifically need a .dmg file for virtualization or USB creation, you can extract the DMG from the .app bundle:
To install macOS High Sierra from the DMG file:
: If you only see a "20MB" file, you may need to update your current Sierra installation to the latest version first before the full installer becomes available. 2. Official DMG Update Files (Direct Download)
Once formatted, right-click the drive again and select .
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierra --nointeraction Use code with caution. Copied to clipboard
Open and execute the following deployment command: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled
Apple distributes the OS as a .app bundle. If you specifically need a .dmg file for virtual machines (like VirtualBox or VMware) or deployment tools, you can build it manually using Terminal.
Compare the output string to trusted community repositories to ensure your installer is secure before deployment.
Apple still hosts this file on their official support servers.
Apple hosts manual "Combo Update" files (like the 10.13.6 Combo Update ) on its support site. Note that these are updates and require a base version of High Sierra already installed to function.
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