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There is a thread running on this, but my MBP had issues the first time around.

I re-set the PRAM ( hold down CMD + OPTION while the machine boots. Release the keys after the second boot commences) Then try the update again.

The link to the thread:
https://forums.macrumors.com/threads/1328868/

Just tried it, didn't work. this message comes up. any idea?
 

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Can you use the thread you just posted to? Gets kind of confusing when two are running on the same topic.🙂
 
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