Devo 12S USB driver for Windows 8Pro x64

Windows 8Pro x64

When I plug in the supplied USB cable into my Devo 12S, my computer says "Unrecognized USB device". Where can I download the USB driver? I did install DfuSE 1.5 USB upgrade.
Also, when the USB cable is plugged in (computer to Devo 12S radio), the cable gets really warm. The first time I noticed it I unplugged the cable very fast being afraid something might burn up. I tried several different USB cables and all of them heat up. Is that normal?

Driver is in C:\Program Files\devention Upgrade Tools
other usb mass storage mode windows should have that one

Did you install one of the experimental deViation builds or do you have the stock Walkera firmware? In the second case the USB port is only used for flashing - it does not present a mass storage device (this can only deViation with its integrated USB filesystem).