When I input my serial number to activate Photoshop CS4, it said the number is invalid. However, the customer service of Adobe told me that the number is valid. What should I do?

When I input my serial number to activate Photoshop CS4, it said the number is invalid. However, the customer service of Adobe told me that the number is valid. What should I do?

Error "The serial number is not valid for this product" | Creative Suite

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