Bought photoshop elements 12, serial expired

hello,
i have bought PS Elements 12 in november on my PC. Now i want to install it on my mac but it doesn't recognise the serial number.
i know i can install it onto 2 machines, do you know why it does that and how can i resolve this?
thanks!

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

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