New version of NR, lost in `settings.js` file

(Machine restarting NR)

Gee there is a substantial change in the settings.js file between 2.1.3 and 2.1.4!

I guess it is just a case of sitting down and going through them.
But basically they are sectionalised in pretty much the same order?

(Nearly running)

Ok, so the settings.js can't exactly be copied from a 1.x to 2.x version - no? (or yes?)

I am also seeing this message:
(sorry)

Your flow credentials file is encrypted using a system-generated key.
If the system-generated key is lost for any reason, your credentials
file will not be recoverable, you will have to delete it and re-enter
your credentials.
You should set your own key using the 'credentialSecret' option in
your settings file. Node-RED will then re-encrypt your credentials
file using your chosen key the next time you deploy a change.

Ok. I thought I had done that. (Moving on)
I copy the flows.json and flows_cred.json file from their backup.

The flows.json has gone from 1.3 meg to 2.2 meg in size.
??

(machine now running NR)
It worked!

(setting that line as you said.)