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Security Update 2017-005 10.11.6 never completes--why?

Security Update 2017-005 10.11.6 causes my El Capitan MacPro's monitor to black out with the cursor showing. It remains like that for hours without completing the update. I'm constrained by my hardware to El Capitan, so I have no options. I tried to perform the update through the App Store and also via direct download but both failed in the same manner.

Mac Pro, OS X El Capitan (10.11.6), Early 2009

Posted on Dec 15, 2017 10:27 AM

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Security Update 2017-005 10.11.6 never completes--why?

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