The DEMO version only includes 4 pages:
http://mp3push.com
http://mp3push.com/sing/78335-billie-eilish.html
http://mp3push.com/sing/44332-artik-asti.html
http://mp3push.com/sing/38714-gayazov-brother.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