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I realize this post hasn't been updated for quite some time, but in case anyone else is searching for information on AutoTURN with Autodesk 2011 products, AutoTURN 6 absolutely does work. We are running it currently in both AutoCAD 2011 and Civil 3D 2011, as well as Bentley Microstation. I can't speak for 2012 or 2013 apps, though we will find out shortly. Just an FYI.
What have you discovered with AutoTurn 6.0 and Civil 3D 2013??