I have been able to advance - a little.
I again ran the Norton Removal Tool then removed this computer from ‘Manage Licenses’ in my Norton Account.
After restarting, I looked for and removed any remaining ‘Norton’ files and folders and emptied Windows %Temp% folder. I found ‘Norton’ folders in the user’s AppData\local and AppData\Roaming.
I then followed the instructions in:
to install version 22 (prior to the revamp).
Finalizing the install, the process connects to the Internet to access the Norton Account and correctly activates the product.
When the installation was complete, I immediately cut the Internet connection to avoid (temporarily) the update to the revamped version 24. I then disabled automatic updates in Configuration.
The product is activated and I have used the manual ‘Intelligent Updater’ downloaded from Broadcom as explained in above link.
Now I have activated Automatic LiveUpdate and the process has installed Updates but, for the moment, version 24 has NOT arrived. I suppose it will at some time.
For the moment the product shows “You are protected” and the ‘Subscription Status’ is ‘Active’.
I will update again as soon as I see that the product shows the new interface from version 24.