I’m testing demo version, but nothing is showing. I’m getting empty page without your plugin. What could be the problem?
Probably you try to see Unreal FlipBook post, but your theme does not support the plugin so you get 404 or only book header. Try to create a new page and edit it with Visual Composer. There you will find a button Unreal FlipBook. Use the button. For details see http://3dflipbook.net/vc-user-manual#insertion-pdf-book-fullscreen.