Sierra 10.12.6 update continually fails on MacBook pro

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chrisc

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There is a persistent message on the screen that updated are due, and one of them is Sierra 10.12.6.  I have tried to do the update via the App Store 3 times, it fails.  I downloaded the update manually 3 times.  The first one said "Checksum error" so I downloaded it again, twice

On doing a restart after running the .dmg file, the computer reported "macOSsierra failed".  I went to Digicape and after a battle, got a copy of the update file on a USB stick.  It still fails

Digicape now want to replace the logic board for R14k.  Their tech said that if the update fails, the computer is on its way out
 
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