Hey,
thanks for pointing that out. I check what's on the page you linked in and as I was happy at first knowing there're lot of stuff to explore yet, I sadly recognize - most of these links does not work any more...
In matter of patches and playable demos, here in gog we don't see any use of that as we patched our version to the latest working (official) patch. Although we upgraded soundtrack to the full version, so check it out :)
Cheers!