The DEMO version only includes 10 pages:
http://webflow.io
http://webflow.io/homepage-b.html
http://webflow.io/projects-a.html
http://webflow.io/projects-b.html
http://webflow.io/about.html
http://webflow.io/contact.html
http://webflow.io/pricing.html
http://webflow.io/shop.html
http://webflow.io/blog.html
http://webflow.io/legal.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://www6.waybackmachinedownloader.com/website-downloader-online/scrape-all-files/ to buy a fully functioning site.
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