The simplest way to install vtkdatawidgets is via pip:

pip install vtkdatawidgets

or via conda:

conda install vtkdatawidgets

If you installed via pip, and notebook version < 5.3, you will also have to install / configure the front-end extension as well. If you are using classic notebook (as opposed to Jupyterlab), run:

jupyter nbextension install [--sys-prefix / --user / --system] --py vtkdatawidgets

jupyter nbextension enable [--sys-prefix / --user / --system] --py vtkdatawidgets

with the appropriate flag. If you are using Jupyterlab, install the extension with:

jupyter labextension install jupyter-vtk-datawidgets

If you are installing using conda, these commands should be unnecessary, but If you need to run them the commands should be the same (just make sure you choose the –sys-prefix flag).