You can find the macOS High Sierra page in the App Store. Note that searching for it directly may not work if your Mac is running a newer OS; you must use a direct link to trigger the "Get" button.
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Depending on your current system, use one of the following official channels: You can find the macOS High Sierra page in the App Store
The official way to download is through the Mac App Store or direct links from Apple Support . While the original 10.13 release is no longer available as a standalone download, users can still obtain the final version, macOS High Sierra 10.13.6 , which includes all stability and security improvements. Official Methods to Download macOS High Sierra While the original 10
Use Disk Utility to format a drive (at least 16GB) as Mac OS Extended (Journaled) .
The standard App Store download provides an .app file in your Applications folder, not a .dmg . To create a bootable disk image or USB drive for a clean installation:
Run the official createinstallmedia command: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume (Replace "MyVolume" with your USB drive's name) .