Then you need to install and run the Java application: 'LPX_to_FL (Native)' will do the same, but for native MIDI mode of the Launchpad-X (Note mode or Custom mode) 'LPX_to_FL' port will transport MIDI message from Lauchpad-X to FL-Studio (pads status)
'FL_to_LPX' port will transport MIDI commands from FL-Studio to the Lauchpad-X Then, setup three Virtual MIDI ports as below: You need to install a Virtual MIDI loopback software such as Tested only under Win10, but should work on other Windows versions, or MacOS. I have developed a small Java application able to make it compatible with FL-Studio by converting Lauchpad-MK2 messages to Lauchpad-X format. Currently, the last Launchpad-X is not yet supported by FL-Studio 20.