DFU always has been kind of funny. I once had a problem (not with wildcat, but with gabonator) reinstalling: always got an .err. Needed to reinstall because by accident I overwrote part of the code. Solution was: install something completely different into the same slot, and then try again. Which in fact solved the problem!
Was not Win10 though, but Win XP (my older 2.70 device with DFU 3.11C). So in case reinstalling whatever doesn’t work, one could possibly succeed by following that procedure.
Have fun 
Thomas