I just got off the phone with "Ervin" at support. He told me the same thing.
I've been wrestling with this problem for 2 days.
The error message says:
"OS X Update can't be installed on this disk. This volume does not meet the requirements of this update."
So it looks like a hardware problem. Luckily it is not.
I was getting very frustrated. I had to exchange my first Mac Mini as the HDD crashed... right after all the updates and app loads, but just before I was to do my backup.
So... as we called such episodes in the military: "Real character-building."
Hope this saves someone some otherwise wasted work!