Thanks for contacting us.
To make your site as per demo https://www.ovationthemes.com/demos/cyber-security-services/ , please refer below to the documentation for a better understanding.
Please take backup of your site if any data is available before activating our premium theme.
Here is the link of the documentation: https://www.ovationthemes.com/docs/ot-cyber-security-services-pro-doc/
We hope this gives you the information you need.
Please let us know if you need anything further and we would be happy to help.