You want to know where the ANZ Country Kit can be found.
The ANZ Country Kit is not something that comes with the standard Civil 3D install
The ANZ Country Kit downloads for all years can be found at the following link:
Then remember to use the ANZ icon on your desktop to start Civil 3D. (not the Metric or Imperial icons which you can delete)
The only issue I have found with this in 2023 so far is that when installed it makes Civil 3D very slow to open until you have restarted your machine a couple of times.
Note: For many years the template has been pointed to is still the incorrect RMS template so you will need to change the default to be the _AutoCAD Civil 3D 2023 ANZ Design.dwt or your own company template.
Type OPTIONS on the command line. Then on the Files tab (below) expand Default template file name for QNEW and highlight the line below. Then click BROWSE top Right.
Then select the _AutoCAD Civil 3D 2023 ANZ Design.dwt or your own company template.
Also, as per every other year, you will also need to set the Pipe catalog to be looking at the ANZ catalog or your own company pipe catalog to make all the pipe and structure sizes visible.