why saves do not work after solving the problem of GTA 5 (Grand Theft Auto 5)

Hello, can you help me when downloading mods for cars, GTA 5 crashed for me, but this is a problem called THE PROGRAM IS DISCONTINUED, so I solved it and now I loaded my sister’s save to add a car to her garage, but the game crashes after a couple of minutes of loading as if that the problem is PROGRAM TERMINATED please help