Other software that uses USB protection (like older diagnostic tools or CAD programs) can sometimes conflict with the Autodata key.
This error is common with older versions of Autodata (typically versions 3.38, 3.40, or 3.45) on newer versions of Windows. It means the software cannot detect the USB security dongle (the Sentinel key) or the software emulation required to run it. autodata sentinel key not found e0209 work