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Q: This update keeps failing due to "unknown error"

I have tried using the app update, downloading the update from website but both get to the restart pop up then says "unknown error, unable to install" then the screen goes dark grey with just a cursor, I left it like that for two hours before holding the power key to force shut down.

 

Please advise.

MacBook Pro with Retina display, OS X Mountain Lion

Posted on Jul 29, 2012 7:06 AM