Jupyter notebook not trusted

Apart from them,
You can click on "Not Trusted"
and click on "Trust" when confirmation window pops up.

It is a security feature to disable the execution of arbitrary code from untrusted notebooks, without the user's consent. There is a doc page on that http://jupyter-notebook.readthedocs.io/en/latest/security.html

It won't prevent you from manually running the code, that's actually one way of "trusting" the outputs.

You can try doing

jupyter trust notebook-name.ipynb

as is stated in the docs.

After that, open the notebook as usual with

jupyter notebook notebook-name.ipynb