Note: If your Mac is running a much newer OS (like macOS Sonoma or Sequoia), the App Store may block the download, stating the software is incompatible with your current machine. If this happens, use Method 2. Method 2: Download High Sierra Using the Terminal
During installation, you might encounter an error stating, "This copy of the Install macOS High Sierra application is damaged and can't be used to install macOS." This is usually a security certificate expiration issue rather than a corrupted file. To fix this, disconnect from the internet, open the installer's Terminal menu, and roll back your Mac's system clock to 2018 using the command: date 010100002018 .
Once completed, the file named Install macOS High Sierra.app will be placed in your folder. Method 2: Terminal Download (macOS Catalina or Newer) download macos high sierra 10.13 6 dmg file
Method 1: Download macOS High Sierra via the Mac App Store (Recommended)
Because High Sierra is no longer the latest OS, Apple hides the direct download link from the main App Store page. However, you can still obtain it legitimately through the following methods. Note: If your Mac is running a much
Open the native browser (other browsers often fail to redirect to system updater links properly).
Before diving into the download process, let’s understand why this specific version remains relevant. To fix this, disconnect from the internet, open
If you run a repair shop or a school lab, for public download. Instead, point users to Apple’s official App Store link or use Apple’s softwareupdate method.
If you used Method 1 or Method 2, you now have an .app file, but you might specifically require a .dmg format. You can create a native disk image using Terminal: Open . Create a blank disk image by running:
: