Despite WordPress recommends PHP 7 version, we recommend to use 5.4 or higher, as not all plugins supporting PHP 7 at this moment.
Besides the recommended server requirements for WordPress, make sure your PHP memory for WordPress is set to 128MB. You can read more about changing the PHP memmory in WordPress codex.
This theme is tested under Mac, Windows
Compatible Browsers: IE9+, Firefox, Safari, Chrome, Opera