The Rhino 7 Archicad Grasshopper Direct Connection works with Archicad 24. It might need to be re-installed after installing Rhino 7. This has been verified by a couple people including PAZ Academy and Graphisoft’s internal testing.
The ArchiCAD .3DM file importer reads Rhino 6 files. So, at this point Save As… back to Rhino 6 for the files that will need to be in read into ArchiCAD as a 3DM file. Graphisoft is aware of this. This will take a little longer to update to Rhino 7.