Our German distributor, Stefan, does still have a few latch expanders. Latch expander MUST be used with latch main controller — non-latch main controller does NOT have the internal circuitry to operate latch expanders. You can contact Stefan to see if he has a latch main controller that you can swap with, or as I said, you can send a support ticket to us and we can sell you a latch driver board. You just need to replace your main controller’s driver board and it can become a latch controller.