When the Bifrost for Maya plug-in is installed with Maya Creative, you can run Bifrost graphs created in Maya, such as custom rigs and other effects, but you cannot edit or create new Bifrost graphs.
If you open a scene that contains Bifrost graphs, you can make other (non-Bifrost) changes, play back, and then re-save: the graphs will continue to work.
Important: Liquid and other simulations created with Bifrost Fluids are not supported for playback. You will get an error message if you open a scene that contains a Bifrost Fluids simulation or BOSS ocean surface. However, the simulations still work when you re-open the scene in Maya with Bifrost for Maya installed if you re-save the scene from Maya Creative.