The DEMO version only includes 4 pages:
http://red-devils.net
http://red-devils.net/index_php.html
http://red-devils.net/showthread_tid-38.html
http://red-devils.net/memberlist.html

It is possible to download these free files and install them on your server, so you can test how the site works.
Visit https://www.waybackmachinedownloader.com/en/buy-wayback-machine-downloader-recover/ to buy a fully functioning site.
Go back to the index page