As a quick followup:
I had also installed FORScan into a Windows XP PC, but it didn't work there either. I found it was because of the drivers I had installed. I had follow instructions for generic FTDI devices and I needed to install the specific driver pointed to by the company's Amazon...
I'm rapidly running out of ideas on how to get this working! Here's what I have tried so far:
I installed Crossover and installed the latest FORScan. Of course FORScan didn't see any device and it also didn't show up in /dev, so I found and installed the MacOS driver for the direct connect...