Garage Door Opener Craftsman 54918 / LFM-20

Has anyone successfully wired an Evolve LFM-20 to a Craftsman 54918?

We purchased two of these 3/4 HP Belt Drive openers to replace very old noise makers. We did not purchase the AssureLink gateway to accompany them based on horrible reviews.

Now, when I wire in the LFM-20, all it succeeds in doing is powering and thus resetting the wall switches for the opener. I have wired it in parallel with the wall switch, just as it was wired on the old opener. When clicked, it kills all power to the unit and the wall switch.