I can't find any recent posts on-line about this issue. Everyone but me seems to have been able to D/L and install the Supplemental Update 2016 - 2003.
I just tried again and got this:
Earlier today I didn't attempt to D/L the update because it claimed to be coming from Apple UK.
I tried again from the Apple Store but again and it told me that I'd have to shut down an open application (wireless B'Band) that was preventing the install. I shut that down but it still didn't install.
I just tried the link in Matreya's post above. This is what I got when I clicked on the disk image:
If I can't install the genuine update it is my computer vulnerable? Thanks for any help.