This is tricky and high rise of snapping plastic case.

There are two black plastic clips down sides just below the ring (roughly in line with button). Release these first with flat head screwdriver and there should be a little more flex in case.

Then you have to life motor out of case by bending the case out of shape at the top. Do one side at a time. Don't bend case more than is necessary.

Then assembly should lift up to like 30 degrees so you can slide out the connector at the bottom.