OK, so I’ve finally completed my system upgrade to Mojave – thanks to all who helped here.
I don’t want to update any farther. A couple of times I’ve been prompted to do so by what I assume is an auto update function. Can this be disabled? Or is it possible to throw a couple of hurdles in the process? I’d just had to accidentally click the wrong button and end up with a new system that’s going wreak havoc on my setup.