Right-click "Install macOS High Sierra.app" and select Show Package Contents . Navigate to Contents/SharedSupport/ to find the InstallESD.dmg .
: Use the macOS High Sierra App Store Link in Safari. This redirects you to the App Store where you can click Get to download the "Install macOS High Sierra.app" directly to your Applications folder.
Right-click your USB drive in the left panel and select . download mac os high sierra 10136 dmg verified
: Find the downloaded file and open it. Follow the on-screen instructions.
Note: If your current Mac is too new (e.g., an Apple Silicon M1/M2/M3 Mac), the App Store may block the download, stating that the OS is incompatible with your hardware. If this happens, you will need to perform the download on an older, Intel-based Mac. Step 2: Create a Verified DMG File via Terminal Right-click "Install macOS High Sierra
: You can access the macOS High Sierra App Store page . Clicking "Get" or "Download" will download the "Install macOS High Sierra.app" directly to your Applications folder.
The script will list all available macOS installers. Look for: 10.13.6 - 17G14042 - macOS High Sierra This redirects you to the App Store where
If you specifically need update packages (which are often provided in .dmg format), Apple hosts them on their support pages: macOS High Sierra 10.13.6 Update .
If the App Store detects an old installer, it will say "Open". To fix this, locate "Install macOS High Sierra" in your Applications folder, delete it, empty the trash, and restart your Mac.