The DEMO version only includes 4 pages:
http://biociencia.org
http://biociencia.org/index_option-com_banners-task-click-bid-15.html
http://biociencia.org/index_option-com_content-task-view-id-132-Itemid-138.html
http://biociencia.org/index_option-com_content-task-view-id-133-Itemid-139.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.
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