def lounge_update_license(self):
        """Download & install a license for your CDRouter system from the
        CDRouter Support Lounge.

        :return: :class:`system.Upgrade <system.Upgrade>` object
        :rtype: system.Upgrade
        """
        schema = UpgradeSchema()
        resp = self.service.post(self.base+'license/')
        return self.service.decode(schema, resp)