If you have been using Autodesk Inventor for a while you may already know this, but there is a process for migrating Inventor’s “Content Center” libraries.  This should be done to ensure you don’t end up with duplicate parts (file names) for the same fastener, pin or other common part.  When libraries are migrated, it allows the new software version and its updated libraries to recognize that a particular existing component is being placed.  The existing model will be utilized in this case.  If the libraries are not migrated, a whole new set of model files will get created when you start placing component from Content Center in a new version of Inventor.

Here is the general procedure:

1. Determine where your current style library is located.  It may be in the default location for individual users, or may be in a common location.
2. Launch the “Autodesk Inventor Style Library Manager”.  This is a separate program in Windows that isn’t started from within Inventor.
3. In the “Style Library 1” area browse to your old style library that you located in step 1.  It should say that “some style collections need migration”.
4. Select the Migrate button at the bottom

I also recommend backing up an previous style libraries before migrating them.  There have been various accounts of libraries failing to migrate and becoming corrupted.  Making a backup and testing the migration is imperative if you have extensive modifications in your existing style library.