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Geoff Shap Author

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

Top-ranking reply

BDAqua

Level 10

245,567 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.

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Catalina Download

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