Make sure you have PHP 7 or higher version in order to use this plugin. You can contact to your hosting provider to learn how to upgrade your PHP version.
PHP Memory Limit
WordPress Memory limit should be 128MB or greater (256 MB is recommended by WooCommerce) For further reading check https://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP.
PHP Maximum File Size, Post Size and Execution Time values
If you are getting errors/warnings during file uploads, demo imports, saving customizer, or page builders; it is recommended to increase these values. Contact your web hosting provider if you don’t have permission to change the PHP.ini file.