Cannot perform the new security update 2019-007 on my iMac. It closes down and do'es not restart
I have mac OS High Sierra, vers. 10.13.6. - Seriesnr. W8023M1BDAS. - Cannot update. It closes down, a little curser-arrow remains in the bottom of the now black screen, and nothing more. I myself have to first shut down and then restart, but the update has not found place. What to do? Joergen Kristensen
iMac 21.5" 4K, macOS 10.13