The Feitian Rockey4 on Windows 11 is held together with digital duct tape. It works perfectly for session-based license checks, but if your software does heavy, low-latency communication with the dongle (every 5 seconds), you may see blue screens.
You have two paths: The “quick and dirty” way (turning off enforcement) or the “proper” way (forcing compatibility). I recommend the proper way. feitian rockey4 usb driver windows 11 top