Hi Matt.
Thanks heaps for the reply. I already have a working CD with the Astronomers Edition (came with my Meade Lightbridge Dob). Unfortunately the "DSI Imaging" option (under "Image" menu) is disabled in this version.
The good news is that another kind IIS member (OneOfOne) has the correct version, and has kindly agreed to cut me a replacement disc.
Cheers,
Jeff