Autocad 14 installation from old student version still leaves watermark

I have a student version of Autocad 14 on my laptop. When I install Autocad 14 full licenced version I still get the watermark version. Even if I totally uninstall the student version first. The student version was licensed for 3 years and I still have about a year left.  How can I load the full licensed version immediately instead of waiting for the student version to expire?

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Image may be NSFW.
Clik here to view.