How do I import the demo_contant.xml doc to activate the theme to use WordPress to build a website? by KulfiSoftware
Demo_content files don’t normally activate themes. You upload a theme framework to your site and activate it, and possibly upload a child theme and activate it. Then your site is up.
Demo_content files usually contain theme settings and dummy posts so you can get a look at how your theme can be set up nicely.
Here’s a set of instructions ...