Need to extend support and add a license for new domain – How to update?

I have a license for Enfold for my current website (which I have not updated since 2017) – it really hasn’t been used/updated in years. I now need to move all this site content to a new domain.

Current site says: Theme Updates
No Updates available. You are running the latest version! (4.0.7)
I am running an Enfold Child Theme.

I have read your instructions on updating Enfold from really old versions and am about to do that. I have already downloaded the files from Envato. I gather that takes me to 4.5 and then I need to make a token to go further. I would like to extend Enfold support first so I can ask for assistance during this process if necessary.

I am planning to use a plugin to duplicate and move all site content to the new domain. So I don’t really want to download the new theme and start over – I hope to keep all my current site settings/child theme/etc. if that is possible by just updating the theme.

I am fine with buying another license for the new domain. But it looks like this token thing is going to be complicated . Can you help me with the right sequence? I really want to keep all my current site settings/child theme/etc. intact if possible.

Should I just extend support for my current license on old site then update theme on that domain so I can do a backup of site and move to new domain? If so, how do I get the new license info into the new (migrated) site? Or do I buy the new license for new domain before I transfer?

Or should I only update as far as I can without the token, move the site and then continue?
BTW I also have an old version of wordpress on the existing domain which I planned to update on the new domain after I transferred it. (WordPress 4.8.17) So I don’t know how far I can go updating Enfold with that version of WordPress.

This isn’t a money thing – I am fine with buying support on either domain, adding a new license, or both of those things. I am just looking for a way to make this process as simple as possible.
Can you advise please?
Thanks