It should be in the section that you downloaded the software. If you can't find it, you can get it here:
http://upandready.typepad.com/up_and_ready/2012/07/product-keys-for-autodesk-software.html
I would also suggest a browser download as well.
refer to your other thread: http://forums.autodesk.com/t5/Installation-Licensing/Autodesk-3ds-max-2012-product-key-invalid/td-p/...
DarrenP
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