Help with sims expansion pack

[LEFT]Hey
Everytime i try to download my sims vacation expantion pack it wont work i put in the serial number but then in the next step it says i have to insert the CD rom…so i do but then it says that the CD appears to be the wrong one. i have already downloaded the original sims but it still doesnt work! please help![/LEFT]

Perhaps you should try to buy it instead of illegally downloading it.

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