I am trying to reinstall Adobe Acrobat XI Pro Student and Teacher Edition (Windows) that I bought and have registered in 2013. I have the 24-digit license no., but it is not recognized.

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

http://helpx.adobe.com/creative-suite/kb/error-serial-number-valid-product.html

Error unable to validate serial number | CS6

http://helpx.adobe.com/creative-suite/kb/unable-validate-serial-number-ccm.html

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Hi williamb79386849,

Could you please tell if you are getting any message when trying to register the product ?

Thanks!

Shivam