The DEMO version only includes 4 pages:
http://wpteducation.org
http://wpteducation.org/browse-a-z.html
http://wpteducation.org/browse-by-subject-and-grade.html
http://wpteducation.org/events.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.
Go back to the index page