Answered
Adobe Acrobat Pro 9.0 won't accept serial number
Adobe Acrobat Pro 9.0 won't accept serial number. Please help
Adobe Acrobat Pro 9.0 won't accept serial number. Please help
you have to use the correct installation file that matches your serial number, http://helpx.adobe.com/creative-suite/kb/error-serial-number-valid-product.html
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