Jupyter command jupyter-nbextension not found.

[rogermeier]

Either of these commands from the installation instructions return an error that says "jupyter-nbextension not found.":

jupyter nbextension install --user --py widgetsnbextension
jupyter nbextension enable --py widgetsnbextension

Here is my Jupyter version:

Selected Jupyter core packages...
IPython          : 8.26.0
ipykernel        : 6.29.5
ipywidgets       : 8.1.1
jupyter_client   : 8.6.2
jupyter_core     : 5.7.2
jupyter_server   : 2.14.2
jupyterlab       : 4.2.4
nbclient         : 0.10.0
nbconvert        : 7.16.4
nbformat         : 5.10.4
notebook         : 7.2.1
qtconsole        : not installed
traitlets        : 5.14.3

What is the recommended method of installing ipysketch for a newer Jupyter version?