Jul 13, 2018 at 5:36 PM
Actually yes, you are supposed to access this mod from the challenges menu. That's really weird that you can't see it, and that the nemesis challenge is gone now. I'm not sure what might have happened with the Nemesis Challenge when you incorrectly tried to apply the fourth ending mod that other time, or what other problems that might have caused. Do you have CS+ backed up? If so, start with an unmodified version of the game, and then try applying the port the way I described in my post above.