Basically nothing to say to this except that it is dark and slightly looking different.
Extract the zip so it is a normal folder
go to 'Users\Lite\Saved Games\DCS.openbeta\Liveries\Cockpit_F-16C'
drag the folder in there
Launch DCS and go to the Options -> Special -> The Jet you want to have it on -> Cockpit -> Select the folder
I did the same thing for the Hornet if you are interested.
If you want to have the Mod :
https://www.digitalcombatsimulator.com/en/files/3344580/
or
https://discord.gg/mmfgxehn9W in #Livery-Artwork