Yes, the ftd2xx.dll file is in the same directory. I had moved the dll files from “Program Files (x86)/Signal Hound/Spike” to this test directory to make an example with the fewest files possible.
I had done another test where the example program opened ftd2xx.dll instead of sa_api.dll, and that was successful.
sa_dll = ctypes.CDLL(“ftd2xx.dll”), so ctypes found that file. I don’t know if that is a useful clue.
Another observation is that with this same computer, running Window 1903, my software failed to open a DataQ data logging module, while it was successful with several other computers running Windows 1803. It generated a different error. It is curious that access to two different devices would fail with the new computer.
Thanks