The DEMO version only includes 4 pages:
http://bird-soft.net
http://bird-soft.net/e/cm_t-birdsoftnet-22-o-9-p-20-l-qs1-f-ifr_ext_iframe.html
http://bird-soft.net/mt/blog.html
http://bird-soft.net/soft_index.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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