Hi
I checked it again yesterday with updated version of the asset pack. There are missing shader functions
Is it possible for you to ask your friend about this functions? Maybe he can provide them to you?
About refund - I bought this pack few mounths ago and only week ago started to use it trying to recreate effect I need in UE. If your friend can't provide to you missing shader functions and it is ok for you to give me a refund after 3 month it would be great. If not - so anyway it is my fault, I had to check it earlier :)