How do I get the security update for High Sierra 10.13.6?
How do I get the security update for High Sierra 10.13.6?
MacBook Air 13″, macOS 10.13
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Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes.
Try the standalone Security Update 2020-005 or 2020-006 (High Sierra) in Safe Mode...
https://support.apple.com/kb/DL2053?locale=en_US
https://support.apple.com/kb/DL2059?locale=en_US