While viewing the course offering, click on the REGISTER button (or if viewing a list of ReSound courses, click on COURSE DETAILS for that course. Then on the registration page, scroll down past UPCOMING LIVE WEBINARS until you see VIEW ON DEMAND. That should enable you to watch a pre-recorded video.
I guess the danger of taking the course now is that on/after 3/18/19, the presenter may be offering an updated version of the course. Presumably the reason for offering a live course from time to time on the very basics of the fitting software is to give providers an opportunity to ask the presenter questions over the web. If you are an absolute newbie and not a hearing aid provider, it might be quite embarrassing and awkward to be asking the presenter questions and since people who are not licensed providers are not supposed to be using the software, the ReSound and Audiology Online folks might not react favorably to discerning that you were a DIY trying to participate in a live course.
It’s a pretty basic course so you will probably want to take some of the other offerings after learning the basics. Good Luck! The courses are very informative in understanding the basic ReSound options.