Hi Lisa! It sounds like you may not have enough memory for your downloads and game files, so when your sim grows to an adult, the game doesn't have enough memory to generate the new files. It also could be conflicting cc and/or hack, but it sounds more like a memory problem. Try removing your downloads folder and see if that solves it. If that resolves it, you're going to have to cut back on your cc, as Uni and the other EP's require quite a bit of memory to generate the game files and cc will hog it and cause crashes.