Thanks for writing in! You can start over by resetting your WordPress database using the following plugin (https://wordpress.org/plugins/advanced-wp-reset/). This will basically remove all of your pages and posts and get to a point of a fresh WodPress installation (ignore this step, if you want to keep your data).
Then setup a child theme by following this guide (https://theme.co/apex/forum/t/setup-how-to-setup-child-themes/57) and add the following code into your child theme's functions.php file.
//adjustments to wp-includes/http.php timeout values to workaround slow server responses
add_filter('http_request_args', 'bal_http_request_args', 100, 1);
function bal_http_request_args($r) //called on line 237
$r['timeout'] = 15;
add_action('http_api_curl', 'bal_http_api_curl', 100, 1);
function bal_http_api_curl($handle) //called on line 1315
curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, 15 );
curl_setopt( $handle, CURLOPT_TIMEOUT, 15 );
Now before generating your App demo content again, make sure that you have Revolution Slider plugin is active and also check to make sure that you're using the latest version of X theme and Cornerstone plugin along with other latest X compatible plugins. You can refer to our version information guide here (https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195). You can then follow our update guide here if required (https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62).
Once you confirm those information, try generating your App demo content and see if that helps.
If you're still having issues, please provide us with your WordPress login credentials in a secure note to check your issue further.