You can do it that way or another way,
1. Download the files into some folder or even to the desktop.
2. Go to MyComputer/C:/ProgramFiles/HTC/AcesHighII/sounds
3. Make a new folder in there and call it something like default sounds (incase u dont like the ones your installing)
4. Take all of the files in the sounds folder and put them into that one file.
5. Take that file and put it where ever you want except the AH2 directories
6. While leaving MyComputer/C:/ProgramFiles/HTC/AcesHighII/sounds open, open the folder where your downloaded all the new sounds (you might have to unzip them)
7. put all of the freshly zipped/downloaded files into this directory MyComputer/C:/ProgramFiles/HTC/AcesHighII/sounds
close everything out and enjoy your new sounds!:aok