For a successful TP-Link Bluetooth 4.0 driver download:

Before downloading, check the label on your physical adapter for a "V" number (e.g., V1, V2.6). Selecting the correct hardware version on the Download Center ensures driver compatibility. Go to the TP-Link UB400 Download Center. Select your Hardware Version from the dropdown menu.

If you purchased the adapter new, it likely came with a mini-CD.

This means:

There are two primary ways to get the official TP-Link drivers.

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