Okay - it's clear that I am not a Windows Weenie. However, I figured it out. I haven't used Windows in so long.
1. Plug my DM-1701 in - recognizes it as a Digital Radio
2. I manually removed this driver from the Device Manager
3. I downloaded the DFuse drivers -
https://www.opengd77.com/downloads/drivers/Dfuse_3.0.6_drivers.zip
4. I manually installed the Win10 driver from the Device Manager
5. I plugged in my radio, powered it up and ran the CPS Software
6. Now I can connect to/read from my radio.
I'm not going to bother complaining that this was so hard, if I would have stopped and thought about it, I probably would have fixed it sooner.
So, done - thanks everyone for all of your suggestions!
Glen - KC1RTD