Hello phoenix,
Please click on this link http://www.acmethemes.com/blog/wp-content/uploads/2016/03/suprmag-pro-demo-contents.zip and the demo content will downloaded. After that unzip that file, you will get the 3 files there. As mentioned above, follow the respected steps to import the dummy data. Here, please follow the documentation to know about how to make the site as demo as well.
Hope, you will make your site awesome.
Warm Regards,
Acme Supports