Thank you for purchasing our X theme, please follow this article how you can import the Expanded Demo (Auto). Make sure you validated the theme first, else you can not import the demo.
Is this your live site (http://italtechgt.com/)? I advise that you develop your new site on a sub-domain so your live site will stay up, but if a downtime is fine with you while you are redesigning the site, then you can directly install and switch to X theme.
Let us know if you need help installing the theme and we all be happy to assist you.