1 pointI'm assuming you download the A_Series_driver? There are two exe files in that zip folder, A_Series_USB.exe and paraDriver0124.exe. Did you try running both to see what happens? Also, given the age of the A-series, the drivers might not work on anything newer than XP and you may need to setup a computer with XP or setup a virtual machine running XP. You might also try the CT/CA/CM/CB - USB to Serial Driver and see what it does.