I started to save this privately, but decided to go ahead with a public post so I can share it. The original archive site for Heroes of the Aturi Cluster, one of the best things ever to happen to Star Wars X-Wing from Fantasy Flight Games, has expired. The original author has collected the materials in a drop box, available at the following link:
https://www.dropbox.com/sh/idahlgp7j63b5rn/AADvW3D4JMnZ_IL2orWza1J1a?dl=0