Once you have successfully downloaded the installer, creating a bootable USB drive is the best way to install the OS on target machines.
Open Terminal and execute the following command: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled download+macos+high+sierra+10136+exclusive
The Install macOS High Sierra.app (placed in your Applications folder). Step 1: Format the USB Drive Open . Select your USB drive. Click Erase . download+macos+high+sierra+10136+exclusive
http://swcdn.apple.com/content/downloads/00/23/041-18175/9pm42fea7rpm74vv3rnmz8srz6rs7t3rfa/InstallAssistant.pkg download+macos+high+sierra+10136+exclusive
虽然我们可以轻易下载到 macOS High Sierra 10.13.6，但需要明白的是，Apple 在几年前已停止签署该系统的安装包，这意味着你的 Mac 一旦安装，可能无法通过在线恢复功能直接回到最新版本。此外，Apple 虽然继续为 High Sierra 提供一定的安全更新支持，但建议你将此系统作为特定旧软件的专用平台，而非常规上网冲浪的主力系统，以确保你的 Mac 免受新型网络威胁的侵害。