Albert,
In the zip file, you will find a collection of files. There are three types of files. Audio, placement and effects.
The audio files are easy to identify and all of those go in your FSX\Sound folder.
The effects files are also easy to identify and they will need to go into your FSX\Effects folder.
The last files are identified with .bgl extensions and they need to go into your FSX\Aiken Creek\scenery folder.
Where I used "FSX\" in these above examples, that will be wherever your FSX main program is on your computer. This was just for these examples.
Please report back and let us know if those sounds are now working for you.
Brad