Hi, im trying to play multiplayer but it shows cd-key problem ?! wheres my cd key ? how i can write it on it ? wtf?
are u selling pirate games? !?!?!

The key should be in your account:

https://www.gog.com/account

Then select the game and check the "More" section.

I don't think he'll understand you. Let me try:

go to account!!! click more!??! you'll find it ther!!! lol!??! wtf?!!!?

:D Don't be cruel ;) ;) Anyway ... this question gets asked again and again (I personally won't respond to these questions anymore. If someone is not able to use a search engine ... ).

I answered the same question from a different user with rep 0. New user. And they didn't even send so much as a 'thank you'. Wasn't too important, I guess.

So ... I don't think the OP will respond and send a 'thank you'.

lol, there is cd-key section which says: CD-KEY HAS BEEN USED!!!!!!!!!! i bought a game with USED CD-KEY ! its a pirate illegal game selling.

Open a support ticket: https://support.gog.com/hc/pl

Because, IIRC, the list of CD keys for the game has been exhausted. Can you stop making shit up?