You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

On my iMac with HIgh Sierra 10.13.6 the update would notinstall and I could not restart my computer until I restored it from a backup disc. Has anyone else had this problem?

How can install this security update on HIgh Sierra 10.13.16 when it will not start up when I try to install it. This is Security Update 2020-005 10.13.6. The computer will not restart and gives an error message saying I should close the installer.

iMac 21.5″, macOS 10.13

Posted on Sep 27, 2020 9:43 AM

Reply
Question marked as Top-ranking reply

Posted on Sep 27, 2020 10:17 AM

Have seen several like reports.


Try the standalone Security Update 2020-005 (High Sierra) in Safe Mode...

https://support.apple.com/kb/DL2053?locale=en_US

Safe Boot, (holding Shift key down at startup).

1 reply

On my iMac with HIgh Sierra 10.13.6 the update would notinstall and I could not restart my computer until I restored it from a backup disc. Has anyone else had this problem?

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.