This indicates a communication error:
Disconnect the BP monitor from the USB cable and exit the BPM software.
Restart the software and try the download again.
If the problem persists there is a problem with the Windows Human Interface. Shut down the BPM software, disconnect the USB cable from the BP monitor and disconnect the USB cable from the computer. Connect the USB cable to a DIFFERENT USB port, this will re-install a new Human Interface driver in Windows. Try the download again.