Does this sucker have proper DIN MIDI ports?
If it does then you are in luck.
Buy a $20 USB MIDI Interface and use the DIN ports to connect to the PC.
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I'm guessing this is an ancient vintage keyboard so even if there was a driver for the USB port a decade or more ago it probably wouldn't work on any modern operating system.
DIN MIDI ports will work just fine as a workaround. It just won't show as "Kurweil" under device manager. It will be something like Class Compliant Audio device.
It's Plug n Play. No driver required.
Then you can work with it with any MIDI software you choose.
Gary