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To end this quickly, you will have to start a new game if you made no preparations in advance (which you almost certainly didn't judging by the question itself).
There's certain games that'll allow you to do stuff like that but usually they won't. However, if you downloaded a DRM free version of a game, and then buy it on steam or some other platform you'll be able to do it since it hasn'¡t been modified in any way.
Keep it mind you won't get any of the achievements though. You'll have to play through those parts again if you care about that stuff.
But as a rule of thumb, if the game doesn't allow modding, odds are you're safer not using the save from a pirated version.