Double-click the downloaded BFD3_Software_Installer_OSX.dmg disk image - please follow the instructions here if you have not yet downloaded this file.
Double-click the BFD3 Installer OSX installer package inside the disk image that appears.
Enter your OSX administrator password when prompted.
Click Next when the installer Welcome screen appears.
You must read and agree to the license conditions by activating the 'I agree...' checkbox.
Click Install to start installing
the files to your system.
Click Done to complete
the software installation.
Please note that the Core Library audio data must also be installed.