Given it is a budget dongle, it is usually plug-and-play on Windows 10/11, but downloading the specific driver from the link above is recommended if it doesn't function immediately.
Never download .exe files from unverified, ad-heavy driver websites. Look for zipped folders containing .inf and .sys files. tech-com ssd-bt-819 driver download
Some users reported having multiple devices from the brand working without any issues. Given it is a budget dongle, it is
Ensure the USB port is functional by testing another device. Avoid using USB hubs; connect the adapter directly to the motherboard port. Given it is a budget dongle
Download the legacy or CSR Harmony Wireless Software Stack from a verified archival driver repository. Right-click the setup file and select Properties .