This is intentional. The licensed driver allows "Headphone Mode" (stereo high-quality) which disables the mic. To use the mic, switch to "Headset Mode" (low quality) in the driver’s control panel. You cannot have high-quality stereo output and a microphone simultaneously on classic Bluetooth—this is a hardware limit, not a driver bug.
The software is distributed as "try-before-you-buy" and requires a valid license key for continued use after a 7-day trial period License Model : Perpetual (one-time payment) per PC. : Approximately alternative a2dp driver license key
Extract the file if it arrived in a ZIP folder before selecting it in the app. This is intentional
Microsoft has shown little interest in fixing this. They have not natively licensed aptX (Qualcomm) or AAC (Apple/Dolby) for Windows. This is where the enters the scene. You cannot have high-quality stereo output and a