Hello @rahul sahu,
We apologize for the inconvenience, but it is recommended that you run the theme install on a fresh WordPress installation.
To do this, you can use the WordPress Reset plugin, which can be found at https://wordpress.org/plugins/wp-reset/.
This plugin will remove all content, including posts, pages, and products, from your site, allowing you to start fresh. After doing so, you can delete the GPL null version and install the original theme from scratch by following the instructions in this video: https://youtu.be/i7STFGZapx8
Best Regards,
8Theme’s Team