From the FAQ...
Inventor Fusion is a technology preview. In order to reduce risk and make it easy to engage in providing feedback, Autodesk® is delivering Inventor Fusion technology as a unique download and install – separate from your production version of Autodesk® Inventor® software. You can install and use Inventor Fusion Technology Preview with the confidence that it will not affect your product Inventor Install and that it will not overwrite any of your production design data.
Autodesk has a history of releasing technology previews as separate installs. For example, customers who participated in the plastic part and advanced simulation technology previews were able to provide feedback that directly affected how those technologies eventually were incorporated into Autodesk® Inventor® 2010 software.
-Kevin Schneider
Autodesk, Inc.
Kevin Schneider