Qing
Thanks.
I have other Macs in my home and they update fine so this is something limited to one Mac.
The problem has spanned multiple updates with multiple operating system - Sierra, Mojave, etc.
It works the same in SAFE MODE and NEW USER.
The Mac is a 2.5ghz retina I7 running 10.14.5 (latest) and has no other symptoms.
Autoupdate works on Adobe and other applications.
There are no 3rd party applications on this Mac - just MS and Adobe subscriptions.
One acceptation - a contact management and CRM application. It is a very mature and well-supported product. It is called "Daylite."
Downloading the newest MAU because it cannot be updated as normal, generally does not fix the problem. ie. when the next update after 12.26 comes out, MAU will list the updates and when I try to download it will give me the "One or more update packages..."
message and fail the download. I will have to manually download the entire package. If if I download the new MAU only, it will fail to download the other packages. (this speaking from the experience of having done this for multiple updates)
The one question we really need to answer - what folder does this update download to? If we can get an answer to that and perhaps the companion answer - what else does the update do while downloading the packages? We might get some insight into what is going
wrong on this particular Mac.