This common error happens because the security certificate built into older installers has expired.

While Google Drive is a convenient distribution method, files shared there are unofficial 99% of the time. Only download them if you trust the source implicitly (e.g., a verified developer’s shared drive). For most users, the extra hour spent finding Apple’s official hidden download link is worth the peace of mind.

To deploy the macOS High Sierra installer, your USB drive must be formatted correctly using the native macOS filesystem. Plug your USB flash drive into your Mac.

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.

With these precautions, you can breathe new life into an older Mac and enjoy the polished, stable experience of macOS High Sierra 10.13.6.

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