How to Fix Mac OS Sierra - the Installer Payload Failed Signature Check

ISSUE

• The installer checks the date on the computer.
• If the date isn’t current, you get the error above.
• The fix involves correcting the date on your Mac.

How to Fix

• If you use an external boot disk, your Mac starts up into OS X Disk Utilities.
• You can access the Terminal by clicking on the Utilities menu and selecting Terminal.
• Once the Terminal has launched, follow these steps.

$ ntpdate -u time.apple.com

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