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

Level 1

8 points

Catalina Download

I have downloaded Catalina TWICE and a quarter way through install, it flashes a notice " Unable to verify OS ".

WHAT is going on ??

Posted on Oct 7, 2019 8:37 PM

Best reply

Level 10

241,013 points

Posted on Oct 8, 2019 12:18 AM

Safe Boot from the HD, (holding Shift key down at bootup), does the problem occur in Safe Mode?

Safe mode attempts to repair Disks & clears lots of caches, so if Safe Mode works try again in regular boot.

View in context

Similar questions