The DEMO version only includes 4 pages:
http://cdu-sierksdorf.de
http://cdu-sierksdorf.de/cdupress.html
http://cdu-sierksdorf.de/cdupress/_page_id_204.html
http://cdu-sierksdorf.de/cdupress/_page_id_111.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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