1. insert license key : FREE-5RTY-POI8-0UYT-IUYT-TGH6 in bb-config.php
i.e define('BB_LICENSE', 'FREE-5RTY-POI8-0UYT-IUYT-TGH6');
2. PHP REQUIREMENT LINK: https://github.com/boxbilling/boxbilling#requirements
