Adding to what @Reaper3 said, if you’re on Windows and own the games via steam this resource by @yasirkula can also work as a save/checkpoint system.(Besides modifying the stats).Here is the forum link for anyone interested : Save manager and editor for Steam (open-source).
Additionally if you own a Mac,by following the instructions on the GitHub page you can compile a Mac OS version of this amazing resource…BUT you will need to make a (free) account to use the Unity Editor to make a Mac executable.It’s also some GB (both to download and install) in size so if you don’t want to bother with all that, you can PM me (or if it’s in popular demand),i can share it on a filehoster for everyone to download.
Of course all credit goes to @yasirkula and the code belongs to him.
Other useful info : I tried running the Windows executable with both Wine and Crossover at first (for anyone thinking about doing this).The app “runs” just fine but the GUI is invisible,so you can’t really use the save editor-manager…