Disconnect the power to the fridge.
First remove the control panel by removing the one screw underneath and then insert a screwdriver into the small square hole underneath in order to pull the lower left of the control panel towards you. You are pulling against a plastic clip and you need to pull fairly hard. Once the lower left clip is free the other three come unclipped fairly easily. At this point it will make life easier if you unclip the wiring connector from the control panel and put it one side.
Next remove two screws from this ice route case (look at your new one to see where they are). There's a third hole near the middle but that's only a locator hole, no screw involved.
Now remember where the cables and water tube are routed (take a picture) and unclip the two wiring connectors and pull the water tube out from the chute.
Install the new one in the reverse order. The only thing to be careful of is the control panel has tabs along the top edge that need to go in first.