George,
I am not sure what I am doing differently, but I am able to download the images as one piece in a good size (2500 x 1800) by clicking on the down arrow button in the lower right corner and selecting "original" size For some reason Tim Swan had a similar issue where he couldn't do this. Did you resolve that Tim? It seems that web sites appear differently to people using different browsers or ISPs. CORN-fusing!
Regards,
Mike Aufderheide