SDK for windwos c++

Hello,
I just bought the usb-uirt, because of the "sdk available from developper website" on marchand website.
but the support mail do not respond, and i can't find this SDK anywhere.
Does someone could help ?
I just bought the usb-uirt, because of the "sdk available from developper website" on marchand website.
but the support mail do not respond, and i can't find this SDK anywhere.
Does someone could help ?