Datapack, if the installers aren't working, you can do this yourself by using Wallmarket to edit Sephiroth's character AI in the KERNEL.BIN. If you set the 60 01 on the fourth line of his pre-battle script to a 60 00, that should make him controllable.
Also, stop demanding stuff, and don't double post just because you haven't had a response yet. That sort of behaviour makes you look needy and entitled, neither of which are particularly admirable qualities.