You downloaded a 64-bit driver for a 32-bit OS, or vice versa. Solution:
Sites like or LaptopVideo2Go maintain archives of CSR and Broadcom drivers. Avoid "driver updater" executables that bundle malware. koga bluetooth dongle driver
Are you seeing a specific error code in Device Manager, or is the Bluetooth icon just not appearing? Bluetooth 5.0 Adapter for PC You downloaded a 64-bit driver for a 32-bit