If I wanted to install Scheduler on my instance of Denodo, then I should need a full Denodo Platform License to have available the Denodo Scheduler. You should take note it is not available under Denodo Express.
If I am intend to take "DEN80EDU15DS Denodo Task Scheduling - On-demand" course then it is not needed to have installed the Denodo Scheduler. As I am a one of the user, I can follow the course videos.
Hope this helps!