As far as I know, it should be possible to update after a successful installation of the unupdated version through Prodesign, because it has been stated that CC installed before the change in requirements still works, also after the updates.
The latest update requires 10.7, and when you download from the Adobe website, that is what you get from the start.
But if you download the CC trial version from this website (it is crucial to follow the Note: Very Important Instructions 1 - 6),
then register, and then download the updates from this website,
you may succeed, and get it working.
If you try it, please report back so we shall all know whether this roundabout way works.