Hello,
First of all great tutorial 
In 4.9, I have a problem at around part 2 (and maybe after that as well). When I set the wall climb animation to root motion (ref pose) it is rotated, so that the character is crawling on the ground instead of climbing. When I set it to something else for root motion the climb animation moves the character up but not forward so it stands in the air until I move it again. What am I doing wrong? Is there a fix in a later video or is it something in 4.9 that changed, so that I might have to go back to 4.8?
Please help,
Apolyon