There are system requirements in order to install and setup theme and its components properly. Make sure that you are running the latest version of WordPress, PHP version 5.6 or higher and MySQL version 5.6 or higher. We also recommend the following PHP configuration limits. https://wordpress.org/about/requirements/
Recommended PHP configuration limits
max_execution_time = 300 upload_max_filesize = 128M post_max_size = 128M max_input_time = 300 memory_limit = 256M