Check your Add-on manager (in the Options menu).
Sounds like your add-on is not installed.
As far as I know it is not a separate add-on that you can install yourself.
It is automatically installed when you install Archicad.
All I can suggest is to re-install Archicad.
But maybe wait a bit to see if anyone else here has other suggestions.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10