Thank you so much! Unfortunately, the games from the bundle don't come with Steam Keys (this is to prevent people from reselling the keys). The only way to get a key is to purchase the game outside of the bundle or directly from Steam.
To update the DRM-free version, you'll have to manually redownload the game. Your save files are stored in a different folder ( Users/{your username}/AppData/LocalLow/Bura/Long Gone Days ) so you don't have to worry about losing them.