The first Autodesk Knowledge Base document about the coming AutoCAD 2013 and Inventor 2013.
Autodesk Sync issues when installing a 2013 release product after installing a 2013 beta product
The TS18744845 document describes the solution to this problem:
The Autodesk Sync component does not upgrade properly under the following conditions:
- You installed AutoCAD Beta 2013 (or Showcase Beta 2013) and subsequently install Inventor 2013.
- You installed Inventor Beta 2013 and subsequently install AutoCAD 2013 (or Showcase 2013 )