The original handle had broken from the stress of use.

I unscrewed the inner door panel and the old latch assembly came out. I went to the circuit breaker and cut off power to the DW. Then I unplugged the old latch assembly and plugged the new one in. There were some springy metal pieces that had to be pushed back to get the old plug off and the new one on. After that it was just a matter of aligning the holes of the latch assembly with the holes for the screws and replacing all the screw holding the door panel, and tightening them up.