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This was listed as Updated in my games and I wish there was a way to tell what is updated about it.
This question / problem has been solved by OlausPetrusimage
Sometime ago GOG added document called Prince Callash Examination Paper. It contains all the necessary information to bypass the copy protection puzzle. Answers were on a .txt file which GOG included with the game, but this new .pdf contains some background information and player can figure out answers to copy protection questions himself after reading that background story.