971      iPhone_iPad_Mac_apple

has anyone had a problem installing this update...

I have a 4 or 5 year old MacBook with 4GB RAM, don't remember the other details. The system was on Sierra 10.12.4. The upgrade to 10.12.6 froze almost immediately. The progress bar shows about 1/16 inch completion and hasn't changed in 24 hours.

Can I force quit or power off without causing more problems?

Can I force quit or power off without causing more problems?

Maybe, but what other choice do you have.

最後更新：2017-08-23 21:07:31

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