Who is the murderer? Some never find out, if he is cunning enough to elude them for long enough. He is normal just like the rest of us, if not a little bit too normal. He is you, and he is me. He is inside the walls, and he is waiting.
Creating a sort of "bundle pack" with all the addons included in one is a good idea. Having going in contact with them, and proposed fixes and changes so this contains the updated copies, avoids problems and is convenient for everyone.