Search your email inbox for the order confirmation sent when you purchased the software. The registration name and serial number are included there. Request a Resend: If you have lost your receipt, use the Official Serial Number Request Form
For those looking for the latest features and security updates, the software is currently far beyond version 9; users on the official forum often recommend checking the upgrade page for newer versions like WYSIWYG Web Builder 20. Request Serial Number - WYSIWYG Web Builder wysiwyg web builder 9.0.5 serial number