Normally I am not familar to User Interface because i'm not that skill when working on this field and i'm tend to go easy in texturing.
But since i'm cleaning around User Interface, i'm doing a favor at least to help this resource give a best chance of working.
Let me start off with the fact that tile04 is geniunely broken. I have to repair them by myself with export it as png. Funny enough, blp lab can't recover transparency so i have do some scrap work here to give it a best shot.
Woahla, it's pretty and honestly download each of them and unzip it is kinda a pain to do but at least import path in consistent.
In all sense, this is nice user interface that fit the blood elf theme. The inventory cover is a bit off but it's not that distracting.
I suggest merged them into one bundle but tile 04 you will either repair them yourself or grab one from me. I'm not taking credit here just for the sake that dentothor is no longer active to do so.
Hopefully my effort can help.
Edit: moderator address the fix so my file no longer neceesary. Original blp for bugged ile04 is here instead.