Its on the top of the back of the booklet in the case the CD came in
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you need an expansion pack to be able to play that game
Disc or manual
Disc or manual :)
Its a different registration code for everyone - so you cant have someone elses code if they have installed it.
If you've purchased the game on CD-ROM then you can find the serial code on the back of the instruction manual. If you have downloaded it on the internet you have to use somebody else's serial code by browsing and searching for one on the web. If you have downloaded it on steam then contact them because this shouldn't happen.