The serial number you have entered is not valid

When you attempt to open the freshly installed software it asks for the serial number of the product. You enter the serial number listed on the back of the product case/box, but it is rejected with the message "The serial number you have entered is not valid". So what's going on?

If this is an older version of AutoCAD/LT, usually when you see that type of error it means that the license has been marked upgraded or returned. To have your license status verified, please contact the Activation and Registration team directly:

1. Visit http://knowledge.autodesk.com/contactus
2. Select “Activation & Registration” or “License Management”
3. Select appropriate subtopics from the pull-down menus
4. Select “I Still Need Help”  if you need personal assistance.

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The serial number you have entered is not valid