Basically what i did was find someone that still had a zip of the x theme files. install the old x theme on my site, then activate the demo i wanted
then I had to navigate to each page, and save it as a content template.
Then I selected them all and downloaded them as a pack
reinstalled the "pro" theme and uploaded the templates I downloaded
This is a lengthy process that every single pro users has to do to achieve backwards compatibility for demos.
They could easily do this once, and add it to the design cloud. I'm not sure what their excuse for not doing this yet is. But it's very disappointing as a consumer.
The design cloud you'll be cited as the replacement feature anytime you ask about demos, has a total of 9 content templates. That are minimal at best.