The manual install directions Readme.MD for input/kbfiltr include the totally misleading suggestion to use "devcon install" to install the filter. "Devcon install," despite the deceptively attractive name, cannot be used to associate an INF file with actual hardware. What "devcon install" does is create a brand new FAKE device with the hardware ID specified, and then use the INF to associate a driver with that fake device. Perhaps a more productive suggestion would be to use "pnputil -i -a" to install the driver package.

I would ordinarily do a pull request to submit a fix, but the philosophy here needs to be officially blessed.