Download Web Services Adapter license and take a note for the control code and the serial number from Progress Electronic Download center (
http://www.progress.com/esd).
Install it on the existing installation using proinst command after extracting the download file. This will add the Web Services Adapter license on the existing installation of other OpenEdge license.
The $DLC/progress.cfg file will reflect the Web Services Adapter license when $DLC/bin/showcfg is run along with other licenses.
This license is for free of charge as a part of deployment components.