Thanks for your response.
Yes, I guess that is what happened. Not a very user friendly design. The warning I was provided when I went to download another demo was specifically that NO content or pages would be deleted. The warning that should have been provided was that Prior demo pages WOULD be overwritten and they needed first to be renamed to be retained before downloading a new demo. If your system had been well designed, actually, you would have provided each demo with slightly different page names so they don't overwrite others.
I thought the point of all your demos was to be able to try out different themes with a website so people can compare their site. If downloading more than one just overwrites and destroys earlier ones, it kinda makes it meaningless.
Your setup notice above btw is incomprehensible.
As for my second issue, my menu disappeared in the latest demo and was replaced with new tabs that actually weren't in the theme. Having to recreate my menu is a pretty long and tedious step to "trying" out different demos themes. Other issues: the Ethos1 template has the slider on top. When I downloaded the theme, it no longer had that. I had to hunt around to figure out where to turn it on. The News page doesn't have anything in it (not sure where that page came from as it doesn't seem to be in the theme). Also the Portfolio tab is a new one, not in Ethos. Finally it looks like Ethos and many of the templates are based on blog postings but i can't figure out how to set up the pages to enter a new blog entry. There doesn't seem to be a template page for the blog entry that flows to the portfolio, news, or slider pages. I can't seem to find any good step-by-step instructions for using these templates either.
I use Cornerstone specifically because I am far from being an expert in wordpress and html. I would guess that most of your customers are like me, reasonably technical but not programmers. You need to create your program so that it is more user friendly for less technical people adn provide more step-by-step instructions.