how do i install the demo content of the above template that i recently bought.
If you check details page you will find:
If you want the demo content in Kanni theme, You can easily import the demo content with a single click through the Unyson Importer . It saves you time and your site would look exactly like the theme demo page.(source)
You can check theme documentation for more details support. If you have still problem with the theme then The best way to get the support is Contact your purchased Theme Author. Contact Author and let them know