I read just now that the actual writer of the game, Christy Marx, put both this and its sequel Conquest of the Longbow up for download on her website.

Here's the page for the Camelot game (the link that says "try this" leads to a download for the game).

I'm not sure if Christy actually has the legal authority to do this. She was the writer, but it was a work-for-contract thingy so Sierra should technically still own the copyright. Still, if you want to try it... although I don't see a link for the documentation or anything like that.

Incidentally, Christy Marx also worked on a number of 80s cartoons. I remember her name from Jem and the Holograms. Unless I'm thinking of someone else.