I believe the plugin is still valid, however I don't have Starry Night latest here. They are definitely still going great guns - I had a teleconference with four of their people including the CEO just a few weeks ago, and saw them at NEAF. The plugin location may have changed, or the installation of the update may have wiped out Planner's plugin. You could re-run the Planner installer and see if that restores it. If not you might want to call them and ask.