[MlMt] Odd message on upgrade

[Steven M. Bellovin]

On 28 Mar 2016, at 8:04, Benny Kjær Nielsen wrote:

> On 20 Mar 2016, at 18:55, Steven M. Bellovin wrote:
>
>> I'd been away from my office for several days.  When I came back, 
>> there was the (expected) upgrade pop-up.  I clicked to upgrade and 
>> got the attached response.  I quite MailMate, restarted, got the 
>> upgrade prompt again, and all went well.
>
> The error message essentially describes what probably happened.

Right, but not why -- why did the upgrade vanish?

> You could also have opened the “Software Update” preferences pane 
> and clicked “Check Now” to re-trigger the upgrade prompt.
>
I quite/restarted precisely because I didn't know how badly confused it 
was.