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1. Copy folder 'Boeing 737-300__Cantu' to your simulators Airplanes folder.
   From that folder copy the files in the 'EFFECTS' folder to your main P3D 'Effects' folder.
2. Copy all content of the 'Gauges' folder to your main P3D 'Gauges' folder.
3. Copy the folder 'JELAIR-sounds' from the 'Sound' folder to your main P3D 'Sound' folder.

That should be it.