Finding an "official" download can be difficult as CSR (now part of Qualcomm) typically distributes these drivers through hardware manufacturers. However, several reputable third-party repositories host the installer files: CSR Bluetooth Stereo Audio Driver 5.0.14.0 64-bit
: Built-in support for the Apt-X codec, which allows for CD-quality wireless audio that standard Windows drivers sometimes lack. csr harmony wireless software stack 5.0 download