ZWO ASI1600MM-Cool Image Download Hanging

I am also having a download issue with SGP and an ASI1600mm cool. I am a new user trying SGP out for the first time. I can connect the camera and set up a sequence, but on running the sequence the program hangs after downloading the first image. I have tried with the latest version (2.5.1.15) and a previous version. I have no problem using the camera with Firecap and ImagesPlus Camera Control.
My system is a Windows 8.1 laptop with USB3 ports.