Hello Peter,
Indeed, simply the demo version 1.93 :
http://www.ideiki.com/astro/Download.aspx
I am not suggesting this is a solution to your W7 64bit issue, but an interesting experiment none the less. I have joined the thread you initiated on the SGP forum with the hope of getting to the bottom of the problem wherever it may be. Been very impressed with the SGP forum and the level of feedback & support. I am going to generate a debug version of my driver that does not require the hardware so that the SGP developers can test out the interaction between client & driver. I am hoping the issue is not with the driver but am happy to stand corrected - either way it gets fixed.
Be very interested to see what happens if you attempt an APT installation and whether this fixes the issue with SGP ......
Cheers & clear skies,
Dave