Web Apps Server Removal from Download Center
As of 11-24-2014 Office Web Apps Server will be removed from the Microsoft Download Center. At that time it will only be available for download under Volume Licensing agreements. For more information please visit the site Volume Licensing Service Center.
Read more at source: http://blogs.technet.com/b/office_sustained_engineering/archive/2014/10/22/web-apps-server-removal-from-download-center.aspx