Apple Issues Emergency Updates for All Its Operating Systems

It feels to me like there’s some disk corruption going on here. Make sure you have good backups! It might be worth reformatting the drive, reinstalling High Sierra, and then restoring from backup.

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Hi Adam, Many thanks for the suggestion. I will do that.

Hi Adam, I took it to a Certified shop where they whipped out the HDD, replaced it with a SSD and had no difficulty installing the Security Update. My goodness, this machine is faster than greased lightning! Many thanks again for your suggestion. All the best, Pascal

Good move! SSDs are far, far better than hard drives for performance and they’re all I recommend these days.

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