Hello, @IP,
Then I suggest you to simply create the new page and then use the XStore Studio feature on it: https://xstore.helpscoutdocs.com/article/148-xstudio-feature-of-xstore-wordpress-theme check the page you want to import is available in XStore Studio and then simply Import it and it will work for you.
Otherwise, Please export your site data such as: (users, Woo Commerce (orders – products, etc), pages, etc and everything like that) via any means, and then reset your WordPress and then start from scratch, Import the new demo you want on your site and then again import the exported data on your site.
Regards 8Themes Team.