Hello,
It seems that the issue may be related to your hosting environment not meeting the minimum requirements for installing the theme. We recommend reviewing the following guide, which outlines all necessary server configurations and settings: https://xtemos.com/docs-topic/requirements-wordpress-set-up/
Please contact your hosting provider and share this link with them to ensure your server meets the required specifications (such as PHP version, max upload size, memory limit, etc.). Once the requirements are met, you should be able to install the theme without any issues.
Best Regards,