You need:
1.Download the file
2.Put the file into X-Plane 11/2\Aircraft\737NG Series\liveries
3.Unzip it
4.Enjoy!
Screenshots by CES1103
CC BY-NC-SA 4.0
B737-700HH for Lucky Air B-5805
Download it into the liveries folder and unzip it.
(If there is no liveries folder in the folder, you will need to create one manually)
(CES8324 screenshot)
CC BY-NC-SA