I have upgraded my computer and reinstalled Acrobat Pro 9 on my replacement laptop.  When I try and to input the serial number, a red cross comes up and a message saying that the serial number is invalid.   Please could you provide advice.   I have already contacted Adobe who say that “I can tell you that the license is active and working fine. Now as the license is not getting activated on your machine, that is a technical issue and i am sorry we will not be able to assist you with this product.  I am afraid, Adobe has discontinued the phone and chat support for Acrobat Pro 10 and prior version products. For the Acrobat Pro 10 and older version products you will have to go to Adobe Forums and the Adobe representatives there would assist you with the old and obsolete products.  Please go to this link and upload your issue or query and they would provide you the resolution. https://forums.adobe.com/community/meet” ... View more