Try searching for "Skrillex - Leaving (Original Demo).mp3" without the "EP". Sometimes the individual tracks are easier to find than the full folder.
For the true fan, the value isn't always in the pristine quality; it is in the capture. It is in listening to a young Sonny Moore experiment with dissonance and bass design before he changed the world. i--- Skrillex Leaving Ep High Quality Download
If you are looking for legitimate high-quality versions of unreleased Skrillex music, the best places to look are: Try searching for "Skrillex - Leaving (Original Demo)