The Berotia chair is a Knoll Studio product. Navigate to Knoll.com and Ordwer their CD or download it. Downloading may be an option limited to the US as I've been trying to do it from Canada and finally gave up, Still waiting for the CD.
Once you've got the object, you should be able to do some drag-and-drop to bring it into ArchiCAD.
Think Like a Spec Writer
AC4.55 through 27 / USA AC27-6000 USA
Rhino 8 Mac
MacOS 14.6.1