There's a post in this very recent thread: Current experience updating TIU and remote software: much less hard than years ago. Post is by Ron045, he includes a link to some drivers that might help with DCS upgrades. I believe they may help with the 'prolific chip set', FTDI drivers or something like that.
I remember reading about this back when Win 10 came out. I did look for it on MTH's DCS download page but didn't see it. Of course, I wasn't looking in the correct place for it... Thinking the problem may have been resolved because it wasn't in the downloads area, I just went ahead with the upgrade.
I think Ray's will give you a good repair. I've heard good things about his services and DCS knowledge. Need to remember that place myself. I could just drop things off to him, and pick them up. About 20 minutes away. No shipping involved!