Hi Hightekk, Make sure that the product & the serial key that you are using, both should be from the site given below https://www.adobe.com/cfusion/entitlement/index.cfm?e=cs2_downloads If it still doesnt work then please try the steps from the link given below http://helpx.adobe.com/creative-suite/kb/error-serial-number-valid-product.html Thanks
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