@Paolo-Serpi, @Alan-Kilborn
I see. Let’s make sure that the Python plugin is correctly installed. I suppose you installed it with the Plugins > Plugins Admin... menu.
Now we are going to see if it is working properly. Please click Plugins > Python Script > Show Console. On the bottom of the console there is a text box, please type in the following code
notepad.new()
and press Run. A new document should be opened. Got it?
If it worked, check again Preferences > Editing > Multi-Editing Settings > Enable (Ctrl+Mouse click/selection).
Try once more time to run the Python script, as described in previous posts.
Other than these ones, I am running out of ideas.