To use WP Rentals, you must be running WordPress 4.4 or higher and PHP5.6 or higher.
You will get errors if you use PHP 3 as APIs integrated in the theme do not use this obsolete PHP version and is is highly recommend it you do not use it either. Please contact hosting to upgrade PHP.
To run the theme make sure you have server memory set to:
To import demo you must make sure you have these server settings:
How To Verify Your Current PHP Limits
Even if you make changes in wp-config, it is very possible the limits do not change because your server is limited from server settings. You can verify your PHP configuration limits by installing a simple plugin – https://wordpress.org/plugins/wordpress-php-info/
If you see limits don’t change you can always contact your host and ask them what the current settings are and have them adjust them if needed.
Please note though that many hosts will try to keep the PHP limits.