[EasyRider]

If all I wanted were then to activate the use of one mod, would you know what files I need to download, install or replace?

Search function at top of page works,for locating Mods to look for and download as well as find threads in the forums relating to what you are looking for.
The search function is at the top of the page,just click on it and read a bit to narrow down a serach for betetr results.

The links I left worked fine for me,I just tried them

Here is the sound mod link again>
(The link is inoperative)

You can not just use "one mod",you must actually "MOD" your game in order to use ,even just one mod.

You have to MOD the game,then you end up with the needed file and folder structure being added to your game.
The cockpit folder from the MOD that you want to use ,can then be placed into the created "MODS" folder to be able to use the cockpit.

The sound MOD would be the absolute minimum files needed to use just one MOD

Easy

PS> why is it so important that you just want to use only one single MOD?
I am just curious is all 8)