I have recently been having issues with resource packs. I downloaded this one in particular, and, like with any other pack, I dragged the .zip file into the Resource Pack folder in the Roaming folder. When I log into my game, the option for the pack doesn't show up at all... This is the contents of the resource pack file: I even downloaded the Ender texture pack converter thing, just to be sure it wasn't the wrong version, and that didn't work either.
This pack is in the old old 1.4 format. The textureEnder updates from the 1.5 format to the 1.6 format, so it won't work on this.
I recommend downlaoding MCPatcher, and running its built-in converters on the pack. There is a converter for 1.4-1.5 and for 1.5-1.6. Both converters need a zip file input, so you'll have to rezip the folder after you run the converter once.
EDIT: I notice that your pack has some CTM and animations. You'll have to use MCPatcher's converters to update those, Mojang's converters will not work.