In Deferment Demo mode you have access to the first 3 readings, presentations, and practice questions of the course. You will not have access to (graded) online exams. Also while in Deferment Demo mode, the work you do is not saved.
In Deferment Demo mode the courseware is installed only for one use. This means if you want to use the courseware again, you will need to install the Deferment Demo again.