I would recommend looking in your account portal and verifying the licensing type.
Can you see if it's SIGN IN or a Serial number. I ask, as most serial numbers have been changed over to named users now.
https://manage.autodesk.com/products
Is this an Educational license?
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Mike Davis![EESignature EESignature](http://autodesk.i.lithium.com/t5/image/serverpage/image-id/1272565i464DC3DC646B4F11/image-size/original)