The DEMO version only includes 4 pages:
http://videodownloader.nl
http://videodownloader.nl/index.php-action-get_movie-url-http-youtube.com/v-awZfw4abXng.html
http://videodownloader.nl/index.php-action-get_movie-url-http-youtube.com/v-x9XujCNwhPA.html
http://videodownloader.nl/index.php-action-get_movie-url-http-youtube.com/v-1iaN3aYsUx4.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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