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Plug your Arduino Leonardo or Pro Micro into a USB port. Windows should make the "device connected" sound. In the MMJoy2 software, click the button. The software will scan the COM ports for a device running the MMJoy2 bootloader.
Since the original project site can be difficult to navigate, most users rely on the following mirrors: mmjoy2 download
Never use a program that promises to "Auto-install MMJoy2." These are often malware. The manual MMJoy2 download and flash process is the only safe method. Plug your Arduino Leonardo or Pro Micro into a USB port