The DEMO version only includes 4 pages:
https://gymnasium-nv.ru
https://gymnasium-nv.ru/register.html
https://gymnasium-nv.ru/news.html
https://gymnasium-nv.ru/index/ispolnenie_zakona_ob_obrazovanii/0-16.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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