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I had an autocad 2008, but recently I've bought the 2011 upgrade version, but when I try to register it give the message: "The serial number you entered for your previous product is not valid" the number is exactly how it's written in my 2008 version. The problem here is: I had to create a new ID because the company doesn't know what was the previous ID. What do I do?
Would it be best to call your reseller