Hello,
Please follow the detailed instructions listed in the documentation here: https://xtemos.com/docs-cat/installation-and-update/?theme=woodmart
And if you still face the issue, then please share your site WP Admin URL and Credentials along with the CPanel URL and Login details under the private content area of this topic, so that I can check and try to install the theme for you on your site.
And also your site shows this: https://pasteboard.co/uHZZS6Dl22IP.png. Please try to fix this first with your hosting provider as well.
Best Regards,