What does it take to get the DM-700 to cooperate?  I have a new USB-63 cable from RT Systems, downloaded the driver first and successfully, but I cannot download any data from the DM-700.  Com port is 8.  When downloading from radio, when I click 'OK', nothing happens at all.

I don't know if this is a clue, but the second time I try to download, I get an error message "could not open port COM8: [Error 5] Access is denied."

I have previously used Chirp on a Kenwood TM-V71A, and for a couple of Baofengs.