The update to R14 requires registration of your DWB license. Once registered, sign in and you will have a list of eligible downloads on the download page.
If you don't show up, send an e-mail and they'll sort you out.
the link to follow is:
http://store.cadimage.co.nz/home.php?page=home
Think Like a Spec Writer
AC4.55 through 27 / USA AC27-6000 USA
Rhino 8 Mac
MacOS 14.6.1