1- rename your old Sounds folder to oldsounds or something like that for safe keeping.
2-Unzip the soundpack. The new folder should already be named Sounds. If not rename it.
3-Stick it in your AHII folder where your old sounds folder is located.
4-Delete your Cache folder just in case. Don't worry, it will rebuild next time you start the game.
That's all there is to it. If you still have trouble, just PM me. We'll get ya set up, and thanx for choosing RangerSounds! Hooah!