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I've purchased the game, the game requires a key to register, but where i can find?
This question / problem has been solved by Vyraexiiimage
at a guess it is probably in the More menu somewhere on the game card in your ibrary they are usually in there somewheres when needed

most likely more>serial keys thats where they stuck mine for two worlds and gog is usually prety consistant with stuff like this
Post edited August 15, 2017 by Vyraexii
As Vyraexii wrote you can find the key under More>Serial Keys in your library. Unless GOG finally fixed it and added the functionality to Galaxy, you have to use the website.

You probably know that, but in case you do not: The GOG version does work standalone – you can use the DLCs without registering.