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
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softwareupdate --fetch-full-installer --full-installer-version 10.13.6 The official way to download is through the