Cendio no longer include RDP support in ThinLinc.
Cendio have been involved with rdesktop for many years as it was a key component in our product ThinLinc.
We decided to focus exclusively on Linux desktops and no longer include RDP support in our product.
It means that we no longer use seamlessRDP for our commercial offerings.
In case you need more information, please contact us https://www.cendio.com/contact