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How long does it take to apply this security update?

On Sept. 13, 2021 Apple released a security update for MacOS.

After applying it and restarting my mac, the white line below the apple reads “about a minute remaining...” but it has taken about an hour it has not moved from about a 10% with 90% still grayed out.

Can some one please help.

Posted on Sep 14, 2021 1:44 PM

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Question marked as Top-ranking reply

Posted on Sep 14, 2021 2:11 PM

Restart your Mac. If you must, shut it down by pressing the power button until the computer shuts down, then restart it.

The process might pick up and continue to the finish.


I just updated two Macs, a 2013 iMac and a 2012 MBP. Neither took longer than ~20 minutes.

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How long does it take to apply this security update?

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