The DEMO version only includes 4 pages:
http://marathonmarcus.com
http://marathonmarcus.com/articles-2.html
http://marathonmarcus.com/category/1/sub-3-hour-marathon-training-diary.html
http://marathonmarcus.com/category/race-reviews.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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