Even though the chip on the amicus18 board is an FT232RL, the USB PID has been changed so that it appears as an "Amicus18 Serial Port" (USB\VID_0403&PID_AC75). Once that was done it required the use of a modified INF driver file.

There is (at least was) a utility on the FTDI site called FT_PROG that would let you change the PID back to the standard FTDI PID for the FT232RL, and that would let you use the standard FTDI driver. I don't know if there are any issues with that (like a loader program looking for the old AC75 PID), but hardware-wise that should work fine.

I've only used FT_PROG on win7 so I have no idea if/how it works on win10.