When I tried recently to install my CS6 it was not possible "the serial number is withdrawn"
I do not believe that my CS6 serial number should be invalid. I bought it in 2012 registered in immediately on my account and there has not problems after - probably 5 - 6 reinstallation since on different computers. You can see my registration on my account - see the print from Account Products attached.
Also at my conversation yesterday with the help desk I was given an offer, and I was promised to get it on a mail. But it has not arrived. Conversation attached