The Sandbox tools can be shown by either going to the View menu, Tool Palettes, Sandbox, or you can get to them at the bottom of the Tools menu. It works in the free version.
In addition to installing Ruby add-ons, you have to go into Preferences, Extensions, and check the box next to the ones you want to use. It may be that the Sandbox one isn't turned on at the moment.
Once you have turned them on they will either be in the Plugins menu, or in the Tools menu. |