Have you had a chance to review Morris Proctor's Training Manuals for L4? I'm sure they are good, but are they necessary? Do they offer help that goes beyond that available in the program already. Like most on this post, I am not a novice with computers, or this software. But I would spend the $60 for the two manuals if I knew I would enjoy a real benefit.
BTW, I installed on two computers, desktop and laptop, and it has worked very well for me. I'm thrilled, and am experimenting my way through it.