Hi @David_C, you appear to have a typo in your path that you have added to the preferences dialogue box - you have missed the backslash following site-packages. It should be:
[‘C:\Program Files (x86)\PsychoPy2\Lib\site-packages\ftd2xx-1.0’]
Also, if you are using this method, you must first import psychopy before importing your new module - see here.