Coreaudio2asio updated for link issue

Hi all

Having an old issue with a MacBook Pro, mr816 and 5.5.3 where headphones and quick connect don’t work. Past posts speak of a coreaudio2asio upgrade driver being the fix but steinberg and other pages no longer exist. Can anyone help me out? FYI I am running 1.7.3 with OS 10.8.3.