The DEMO version only includes 4 pages:
http://peter-bruechmann.de
http://peter-bruechmann.de/en/index_menu__content.html
http://peter-bruechmann.de/de/index_content_start.html
http://peter-bruechmann.de/de/index_menu_2_content_dino.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 to buy a fully functioning site.
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