Dark rituals

Six friends in the computer department receive a message to download an application called (Dark Ritual) from a person who finds it difficult to have a request rejected. As soon as he starts downloading the application, he faces cursed satanic challenges. If he refuses, he will receive greater torment, and in order to finish it, he must send this application to another friend. How will this curse end? What is the secret of the strange murders that happened to their colleagues in the same department?