Realtek discontinued Win7 support for BM05E-V2 01. Use legacy driver version 1.7.1016.3000, but expect limited functionality.

The safest way to get the driver is to search for the chipset manufacturer (Realtek) or use trusted driver database websites. 1. Download via DriverHub or Realtek

If the device is not recognized or shows a "Driver Error" in Device Manager, follow these steps: USB Bluetooth Driver (V2.1+EDR) Drivers Download