Hello- I have a full- paid for commercial verison of AutoCAD for mac 2013. I had some troubel recently when my Macbook pro autoupdated to El Capitian when I thought I was only upgrading itunes. I was able to restore my MAcbook from time machines but had trouble with AutoCAD. I went through all the workarounds and eventually had to download and installed AutoCAD for mac 2015 then use the 2015 uninstaller to uninstall 2015 CAD and 2013CAD. 

I am now up and running with CAD for mac 2013 however, eveything I work on prints with this annoying watermark "Produced by an Autodesk Educational Product." 

This is unacceptable for presentations and I have to get rid of it. Please help.