Deactivated HTTP Loopback Connections: or Unyson: Your website is hosted using the LiteSpeed web server.

It's necessary to perform the following steps:

1. Connect your host via FTP in Binary Mode and open in code editor file .htaccess

Add at the end of the file the following directive:

RewriteRule .* - [E=noabort:1]

Save file.

2. Then open in code editor file wp-config.php At the end of this file add the following lines:

define('ALTERNATE_WP_CRON', true);
ini_set( 'allow_url_fopen', 1 );

Save file.

Then return in WP Dashboard => Tools => Demo Content Install and run installation once more.