Hi James, not sure if the skin comes with folders involved, if not make them as follows. Make a new folder and name it "skins" put this folder in your Rise of Flight/Data/Graphics folder. Make a folder with the exact name of the aircraft such as "fokkerd7" or "albatrosd5" and put the matching DDS file skin in that folder. Those folders go into your new "skins" folder.
For the Albatros you will make the albatrosd5 folder. Your folder paths should look like this: Rise of Flight/Data/Graphics/skins/albatrosd5
Or like this: