sudo ntpdate -u time.apple.com
: Apple provides "Combo" and "Standard" update files for version 10.13.6 on their official support pages. macOS High Sierra 10.13.6 Combo Update macOS High Sierra 10.13.6 Update --- Macos High Sierra 10.13.6 Dmg Google Drive
This error often appears when downloading DMG files from non-Apple sources. The installer includes an expired or missing code signature. To resolve, set the system date back to a date before the certificate expired (e.g., using Terminal: date 010100002018 ) before running the installer. sudo ntpdate -u time
Instead, users can pull the official full installer directly from Apple's servers using specific App Store pathways or verified command-line tools. Official Methods to Download macOS High Sierra 10.13.6 Method 1: The Mac App Store Pathway To resolve, set the system date back to
Apple’s official “Purchased” tab only shows older installers if you downloaded them before. Google Drive provides a high-speed, resume-friendly download for IT pros and hobbyists.
Click to download the official, secure Install macOS High Sierra.app file straight to your Applications folder. How to Create a Bootable USB Drive from the DMG