Adobe CS4 rejects serial number

Dear all,
I originally bought the CS4 package a few years ago. I have now upgraded to a newer computer (Apple PowerBook running OSX 10.9), and re-installed CS4 on this computer. However, I can not get the newly installed copy to work (except as a demo) because the programs tell me that the serial number I enter is not valid (it is also marked with a red cross after the number immediately after I enter the last digit, so I do not think this a problem with reaching the Adobe website).
Of course the software is old and all - but I would still like to be able to use it. What could be the issue, and how can it be resolved? Is it still possible to get CS4 activated or is it simply too old?
Thanks!

To locate the serial number:
http://helpx.adobe.com/x-productkb/global/find-serial-number.html

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