For Windows computers (XP, Vista, Windows 7 and Windows 8): software driver download link.
Please unzip the downloaded package and double-click on the "setup.exe" file, then follow the on-screen instructions to finish this installation. Select the HA-1 as your sound output device by setting "Control Panel -> Hardware and Sound -> Sound -> Playback" to "OPPO HA-1 USB Audio 2.0 DAC".
For Mac computers, no software driver is required. Please set "System Preferences -> Sound -> Output" to "OPPO HA-1 USB Audio 2.0 DAC".
Currently there is no software driver available for Linux computers.