My second Bf109K-4 paintjob. ( with the RUST&DIRT WW2 skin overlays by PicksKing )
It's a 8-skinpack based on the 5/JG54 with it's squadron logo and different levels of dirt and shadows on each of the eight individual skins. ( Not full historical represented. )
Unrar, copy and paste the containing folders to ( C:\Saved Games\DCS.openalpha ( or DCS 2.x .... ) \Liveries\Bf-109K-4 ) if you have already created such a Liveries folder.
Otherwise I strongly suggest to create a Liveries folder for all your downloaded skins/skinpacks in the Saved Games section.
This way, you keep your DCS install clean.