When you access the GBC packages from the Four Js Product Download Area, you will find two packages: the runtime package and the project package.

GBC runtime package

The GBC runtime package is a fully-compiled package of the Genero Browser Client. You can download this package and deploy it on to your production system as-is. It provides a default GBC, giving you the default look-and-feel and theme options. You cannot modify the runtime package.

GBC project package

The GBC project package is the package you must download if you plan to do any customization. It gives you the project files in the directory structure that you will need to start your customization efforts.