if you are talking about a retial key , you get it from buying the game. in teh box version it is in the manual.
If you buy the game online depending on where you buy it you either will get an email withthe key or you will have an account at the sell that you can access to get your key.
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If you buy the game online depending on where you buy it you either will get an email withthe key or you will have an account at the sell that you can access to get your key.