Extract the zip file contents and:
- Copy
FlyAirplane.dfmodto your game mods folder.../DaggerfallUnity_Data/StreamingAssets/Mods/ - Copy the folder
FlyAirplaneModto your game textures folder.../DaggerfallUnity_Data/StreamingAssets/Textures/
Extract the zip file contents and:
FlyAirplane.dfmod to your game mods folder .../DaggerfallUnity_Data/StreamingAssets/Mods/FlyAirplaneMod to your game textures folder .../DaggerfallUnity_Data/StreamingAssets/Textures/