I was not aware of nor can I find any reference to videos 4 and 5 for this series. You never know!
Again, this is my favorite course from Griff and it is a lot of fun.
I just found this link - give it a try. It refers to 6 free lessons.
http://bluesguitarunleashed.com/acoustic/index-splash.php
If you like to use picks, fingerstyle, or hybird picking, you will enjoy this course. There is something for everyone. Because of my background in music I like the concept of being your own “orchestra”.
Tom