This caught me a bit by surprise as we use the paid system on most of the machines I manage and, on there, the update is automatic. However, if you use the free version then you will soon be getting update suggestions. There doesn’t seem to be a time limit yet unlike last year’s debacle so there is no panic, but it will need to be done sometime. It looks quite stable and, as I said, has been on the paid version for a little while.
To get and install it, you need to navigate through their site. You don’t want the free trial versions, you need the real free version, the one they call Free Basic Protection. From then on the install is just like version 8 which I documented last year, except there may be a few fewer questions to trip you up. If you have disabled the link scanner in the browser, it doesn’t seem to get reset or maybe it is not used any more, I am not sure.