How do I know if I am using Creo Illustrate or Creo Illustrate Essentials?
It says in the title bar of the application, it will either say:
Illustration name.c3di - PTC Creo Illustrate
illustration name.c3di - PTC Creo Illustrate Essentials
It will also tell you in the 'About PTC Creo Illustrate' dialog which is accessible via File>Help>About PTC Creo Illustrate.
Lastly if you are running essentials you won't have the 'Advanced' button in the animation ribbon.