Hi @JColvin ,
Sorry to disturb you, but I have not found other solution.
Same symptoms: The programmer is not recognized by the adept software, JTAG HS3 cable is detected as a 'USB Serial Converter'. Attempts to reinstall the driver cause 'Digilent USB Device' to appear under 'Other devices' with an exclamation mark in front of it and property 'The drivers for this device are not installed. (Code 28) There are no compatible drivers for this device.' After a few seconds it disappears and shows up again as 'USB Serial Converter'.
Best wishes,
Aleksandr
