In a large bowl, combine cake mix, butter, eggs and water.
When fluffy, stir in coconut, half of the sliced apples and cinnamon.
Pour batter into a greased 11X9" baking dish.
Top with remaining apple slices Bake at 350* for approx 40 minutes.
**edited to add, when I finally made this , I still had dough in the center, so cooked for an additional 10 minutes. I would start at the 40 minute mark and check it since ovens vary so much.