According with this Styling | Dash for Python Documentation | Plotly there are 2 options to follow, I can’t run none of them.
The online version available at: https://dash-gallery.plotly.host/cytoscape-advanced
I’m prompted with a login popup, I tried to subscribe to the forum, not the same credentials, I tried to subscribe to plotly studio, not the same credentials. Clicking on “forgot password” and then on the 3 lines on the top (menu), there is a signup option which leads you again to the signin page 
The other option is running the same locally using this code: dash-cytoscape/usage-advanced.py at master · plotly/dash-cytoscape · GitHub
however there are these 2 dependencies
from demos.editor.callbacks import assign_callbacks
from demos.editor.layout import layout as cytoscape_layout
and I can’t figure out which package contains them (they are not in the main dash package, as I get the following error:
from demos.editor.callbacks import assign_callbacks
ModuleNotFoundError: No module named 'demos'
This is a bit frustrating, any hint? Thanks 