This download contains 2 fictional Swiss Air Force skins for the Su-27.
The 2 skins are slightly different, apply to any country and are applicable to DCS 1.5 and to 2.2.
Extract the contained 'Liveries' folder into your personal 'Saved_Games\DCS-Version' folder (e.g. C:\Users\<your_name>\Saved Games\DCS\Liveries). Or merge, if the Liveries\(su-27) folder already exists.