The Global ARCHICAD Community

[mikas]

Grasshopper comes built in with Rhino just as you wrote, no additional download is required for GH. The AC/GH connection plug-in has to be downloaded and installed of course.

You can only have one connection plug-in installed at any time though. You have to choose a ArchiCAD version to use, and stay at it if you want the AC/GH connection to function. Make sure you uninstall other/older plugins first, only after that install the new one.

On Mac:
AC22->Rhino 5.x, AC/GH plug-in accordingly
AC23->Rhino 6, AC/GH plug-in accordingly

Please read this post too, it might help you:
viewtopic.php?f=43&t=66248&p=299088&hil ... er#p294897
and maybe this one too:
https://helpcenter.graphisoft.com/knowledgebase/75721/