Windows 11 has stricter driver signature enforcement. To install an unsigned Redgear Elite Wireless Gamepad driver (if you find one):
The is typically a plug-and-play device on modern Windows (7, 8, 10, 11) and does not require a separate proprietary driver for basic functionality. It uses XInput (Microsoft’s standard Xbox 360 controller driver), which is built into Windows. redgear elite wireless gamepad driver
If you have followed this guide and your controller still fails, contact Redgear support for a warranty claim. For 95% of users, simply plugging in the dongle and pressing the Guide button is all it takes. Redgear Elite Wireless Gamepad — Complete Feature List