There have been extensive changes made to XFur Studio™ internal API for XFur Studio™ 4. While these changes provide a much easier and intuitive access to the asset’s features and functions, they may break code designed for version 3.
To ensure an easy upgrade process, as long as version 3 is installed in your project concurrently with version 4 and the appropriate upgrade extensions have been unpacked, all of the old API commands and properties for the different classes should work with minimal changes, while internally referencing the new API and entry points.
Through the inline comments and documentation (available in your preferred IDE) you will see the updated APIs and property names, so that you can update your code at your own pace.
A full breakdown of the API and the public properties and methods for each class is available in this documentation.