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Each PC game will have its own unique product code. If you have lost it you could try to contact the tech support for the game.
(Or you could try to find a keygen / used key online. Although this is illegal)
I also have Sim City 4 Deluxe edition, and the package came with 2 CDs. Which were, the download and installation CD, and the gameplay CD. Now if you put in the Game Play CD without putting the Download and Installation CD in first, then that message might come. And if not, then the Gmae Play CD might be damaged, you can try rubbing alcohal and blowing on the CD, but if that doesn't work, see if you still have a warranty and try replacing the CD.
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