Go to EFI.com (They make the Fiery)
Their drivers section has a driver for the 242/252/260 that replaced your 240/250 model that works (mostly) fine with Windows 10.
I'd direct link it, but you can't, so you will need to brosw it your self.
I have a Xerox DC240 witha bolt on fiery on the rear. I have recently had to wipe one of the PCs which connects to it. I have 3 other PCs all on Win 10 x64 which also connect to it and they work fine. Currently I am unable to find a Print Driver that operate the DC240 from the newly installed PC.
Obviously there is a driver that works fine with it as the other PCs are ok, but I was wondering if anyone could advise where I can get the driver that works.
Let me know if I need to post any more details, but don't want to ramble on at this time.
Thanks in advance.