Dear Submariner,
All you have to do is to download a free software, readily available at
Web:
http://www.users.on.net/~jscones/software/
Run the program, but make sure that you point the install directory to the Silent Hunter Sub-directory on your Hard Disk. Then Run the program this will create a sub sidrectory within Siltent Hunter called Mods.
Add the mods into this sub-directory which had been created. Look at your desk top for the program. Good Luck and Good Hunting.