CS6 product key not valid

Unfortunately, nobody in this user-to-user forum can help you with am invalid serial number.   Contact the vendor who sold you CS6.

If you purchased CS6 directly from Adobe, contact customer care by logging in below and click the chat bot icon. 

https://helpx.adobe.com/contact.html

Invalid Serial Number https://community.adobe.com/t5/Get-Started/I-purchased-CS5-years-ago-but-attempts-to-download-it-now-fail/td-p/9246661
-https://helpx.adobe.com/x-productkb/global/invalid-revoked-serial-numbers.html
-and revoked volume number https://community.adobe.com/t5/Get-Started/Feeling-cheated-CS6-serial-number-revoked/td-p/9807405
-Problems with software validation https://community.adobe.com/t5/Get-Started/Has-anyone-had-a-POP-UP-problem-I-get-a-pop-up-window-that-tells/td-p/8794013
-Warning that software is not genuine http://www.adobe.com/genuine.html
-http://prodesigntools.com/dont-buy-adobe-software-on-ebay-craigslist-or-amazon-marketplace.html
Invalid software https://helpx.adobe.com/x-productkb/global/digital-certificate-revoked-aam.html
-and more information about fraudulent sellers in https://community.adobe.com/t5/Get-Started/My-CS6-serial-number-has-been-revoked/td-p/9162503

Also - beware of answering anyone who sends you a private message
https://community.adobe.com/t5/community-help/avoid-phishing-3-easy-ways-to-identify-adobe-staff/td-p/10791730