Include files are included at compile time not run time, you would have to do this as .dll rather than includes.
That said, all you really need to do is have your patcher / update system send an updated .exe and any updated media.
A common practice is to actually distribute two applications, a patcher and the game itself. Players don't run the game directly they run the patcher which handles updating the game then launches the game.
The game can likewise handle updating the patcher
A single player RPG featuring a branching, player driven storyline of meaningful choices and multiple endings alongside challenging active combat and intelligent AI.