What blasphemy...
You should absolutely replay the game! It is way to good to be played only ones!
But don't worry, the savefiles should be saved not in the folder but... Idk... In appdata or in the registry or somewhere? Anyway's, after installing the new version and launching it if you didn't reset your pc or somehow deleted those files as well it SHOULD just show your saves. But no warranty given if you completely deleted the game xD