1- Add mus to the game folder and replace anything if there is anything to be replaced
2- Add lang to the chapter 1 folder and replace it.
3- For the Chapter Select, using Deltapatcher, in the original file choose the original data.win
   of your game in the steam folder and the XDelta Patch of the chapterselect.xdelta and then patch.
   Should says a patch successful and if not, either it's pirated or something is changed in this
   either ways it works with me.
4- For Chapter 1, using Deltapatcher, in the original file choose the original data.win
   of the first chapter in the Chapter 1 folder in the steam folder and for the XDelta Patch,
   choose the chapter1.xdelta and then patch.
5- Add audiogroup1.bat to the chapter 1 folder and replace it.
if it give a path error just try again, while testing i kept having it and solved
by just trying choosing the files and patching again.
if there is any other issues happens tell me in the comments of the mod page.