If you have installed the goodies after you have already used 26, there is a bug where the commands will not be added to the menus.
Solution is to manually add the commands to your menus in the Work Environment.
Or easier, is to re-install Archicad itself
No need to un-install.
Re-install and use the 'repair' option if it is offered.
Do not start Archicad.
Install the goodies.
Install the latest update.
Now start Archicad and the commands should be there.
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