The DEMO version only includes 4 pages:
https://www.sunnidownloads.com
https://www.sunnidownloads.com/p/articles.html
https://www.sunnidownloads.com/p/pdf-files.html
https://www.sunnidownloads.com/2022/08/2022-pdf-rabeeul-avval-programs-pdf.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