The DEMO version only includes 4 pages:
http://happy-wheels-full.com
http://happy-wheels-full.com/happy-wheels-2.html
http://happy-wheels-full.com/happy-wheels-3.html
http://happy-wheels-full.com/happy-wheel-full-version.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