Hi Martin
*disclaimer: any amendments made to London Control is done at everyone’s own risk! I am not part of the official LC team *
The way I replaced my sound file directory:
1) copy your sound directory to a different location on your hard drive. Preferably outside the LC directories, I would even do it outside the DM Aviation directories.
2) Rename the ‘Sound’ directory something like SoundOriginal
3) copy the Sound directory from your latest update files to the LC directory where your now ‘SoundOriginal’ sits.
Hopefully this works. It did for me. Admittedly, I forgot to make a back up of my original files… doh.
Good luck, C