sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled Use code with caution.
into Terminal, then press Return:
: High Sierra introduces the APFS file system natively for SSDs. If the installation fails at the drive conversion stage, verify that your target drive's partition scheme is explicitly set to GUID Partition Map rather than MBR. macos high sierra download dmg install
If you are using a compatible Mac running a version of macOS prior to High Sierra, or a version up to macOS Catalina, you can pull the installer directly from Apple.
Install and launch the app, granting in System Settings if prompted. sudo /Applications/Install\ macOS\ High\ Sierra
This is Apple's recommended, free, and most reliable method for creating a bootable installer, which works for both .app and .dmg installers.
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to begin downloading