For this theme to work correctly, you need at least WordPress version 4.5+. It is strongly recommended that you always use the latest stable version of WordPress to ensure all known bugs and security issues are fixed. Other requirements:
- PHP version 5.6 or greater. We recommend you use PHP version 7.4+.
- MySQL version 5.6 or greater OR MariaDB version 10.0 or greater.
- The WordPress memory limit of 128 MB or greater.
Check this article for more details:
Recommended PHP Configuration
Numerous issues that you may run into such as white screen, 400 error, 500 error, demo content fails when importing, empty page content and many other issues are all related to low PHP configuration limits. The solution is to increase the limits. You can do this by yourself using Cpanel, or contact your hosting provider and ask them to increase the limits to a minimum as follows:
- Max_execution_time: 300
- Memory_limit: 128M
- Post_max_size: 54M
- Upload_max_filesize: 128M