the sn is for the product i am trying to install.
I meant are you sure that the number you're entering which you think is the serial number is definitely the serial number - and not another number such as the redemption code?
http://helpx.adobe.com/x-productkb/global/find-serial-number.html
http://helpx.adobe.com/x-productkb/policy-pricing/serial-number-retrie val-process-faq.html
How did you purchase the software? From Adobe or a reseller?
If you have definitely established that the number being rejected is definitely the serial number which you received for the product (and not a redemption code or some other number such as a product number) then call Adobe Chat to resolve