I think you can find some objects at
Turbosquid The 3ds-import-plugin is also available for AC10. In the German-version you've only to put them from the "ArchCAD-Zusätze"-folder (=ArchiCAD Extras?) to "Add-Ons"-folder and restart ArchCAD.
Sorry, my english is terrible but I hope you understand what I meen.. ... (und alle deutsch-englischsprachigen korrigieren mich bitte, wenn ich Müll schreibe
😉 )
greetings, poeik
ArchiCAD CHE 5 - 27 - Windows 10