Here is the general procedure:
- 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.
- Launch the “Autodesk Inventor Style Library Manager”. This is a separate program in Windows that isn’t started from within Inventor.
- 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”.
- 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.