The DEMO version only includes 10 pages:
http://webflow.io
http://webflow.io/about.html
http://webflow.io/shop.html
http://webflow.io/home-2.html
http://webflow.io/blog.html
http://webflow.io/faq.html
http://webflow.io/blog/juice-up-your-day-with-colors-of-the-rainbow-and-sip-natures-goodness.html
http://webflow.io/info-pages/changelog.html
http://webflow.io/info-pages/style-guide.html
http://webflow.io/info-pages/licenses.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://www3.waybackmachinedownloader.com/website-downloader-online/scrape-all-files/ to buy a fully functioning site.
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