I followed the Wizard and the Demo Content would not install. I selected the option and when I went to visit the website it was empty. No added pages, nothing in the media galley, nothing.
Thanks for reaching out and using STAX. Can you provide a link to your site? Also, who is your hosting provider?
In some hosting environments the memory is limited, and the setup wizard can fail. I would recommend trying again, or contacting your hosting provider to increase the resources and. memory of your server.