abccomputer Hi
To further investigate the issue you're experiencing, could you kindly share the detailed system information of your server? Specifically, we would need to know the PHP version and the Database version.
Alternatively, you could try uploading the default Joomla 5 package from this link: https://downloads.joomla.org/cms/joomla5/5-1-0. Install it on your server and observe the outcome. This will help to know if Joomla 5 can work well with your system or not. As we ran a test by downloading and installing the quickstart package of this template with Joomla 5 in our dev environment but it worked smoothly!
Regards