if there is an update later, do I have to reinstall the application?
Yes, you will have to download the new version and start a New Game. However, when you click New Game, there's a prompt that will let you jump to the end of the last chapter and start Chapter 10. You won't have to play all the way back through. Using old saves will corrupt the save file and you WILL get errors and the game will crash. Some people tend to snoop in the code and look for game clues as spoilers so I never include things for future updates in the code. Because of that, you have to start a New Game with each update so that it loads all the new variables.