And what about trying to open while holding down Control key?

as well, could you try opening it with hdiutil, as outlined here:
https://deciphertools.com/blog/2017-10-02-no-mountable-file-systems/

As well, and here we are getting into weirdness, could it be that
security settings differ per country/language, and there could be some
blacklisting going on on US machines? From the same link:

"I was able to resolve this problem by opening up my macOS Security &
Privacy settings, navigating to General, and then clicking Allow on
the app developer that was being blocked."

----------------

it could also be that out dmg building is using an outdated process,
and something goes a bit wrong.

\begin{flame}
-- Of course you should contact Apple Tech Support, you're paying for
it, aren't you? :-P
\end{flame}

Cheers
Dima
On Fri, Oct 19, 2018 at 2:05 PM Dima Pasechnik <dimp...@gmail.com> wrote:
>
> did you check md5sum of dmg?
>
> On Fri, 19 Oct 2018, 13:57 kcrisman, <kcris...@gmail.com> wrote:
>>
>>
>>> maybe different security settings matter?
>>> Have you copied the thing to Applications?
>>>
>>
>> Can't copy anything if the dmg won't mount!  Nothing I tried seemed to get 
>> around that :-( including moving the dmg various places, though it would 
>> have really surprised me if that had made a difference.
>>
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