Speaker Impedance Testing

Has anyone successfully tested speaker impedance with this device?  I bought this device based on its advertised ability to do this but haven't had any luck.  The software is always crashing, the website has dead 404 links everywhere, and the instructions are pretty much non-existent.  I see there are many units available in Mouser and Digikey which makes me think that nobody is buying them and there isn't any real software or documentation.

I'd sure like to  see this thing working.  I've had trouble with stability with the signal generator and had to restart the device a few times to reset it but finally it worked for a bit.

Any help in getting the impedance meter working would be greatly appreciated.