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Navigate to System Preferences > Software Update and install any remaining security patches or Safari updates.

Open your web browser and click this official link: Get macOS High Sierra on the App Store. The App Store wrapper will open on your Mac. Click the button. download+macos+high+sierra+10136+exclusive

To download macOS High Sierra 10.13.6, you can use official Apple support links or specialized third-party utilities if you are on a newer Mac that restricts older downloads. Navigate to System Preferences > Software Update and

： 在安装 High Sierra 时，Apple 文件系统会针对固态硬盘进行升级。虽然这能大幅提升性能和安全性，但如果你的旧 Mac 使用的是传统机械硬盘，或者你需要保持与旧版系统的完全兼容，请务必提前备份数据。 download+macos+high+sierra+10136+exclusive

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume