jQuery issues / TagDiv Composer not loading

http://www.southantrimvox.co.uk

(I’m happy to give admin login details, but not via the public forum!)

Hoping you can help. TagDiv Composer wouldn’t load (just hung as opening). I installed the plugin jQuery Migrate Helper and reverted the jQuery version from default to the only other option ‘legacy 1.12.4-wp’. TagDiv Composer is now working again.

However, there are various alerts now appearing related to jQuery (not on the front end) and I wondered if you had any suggestions / comments…? The theme and theme plugins are all up to date.

First:

jQuery Migrate Helper

Right now, you are using a plugin to support some old code in this website’s jQuery JavaScript library. That code is deprecated, meaning it is basically obsolete and is losing the support of your themes and plugins, and WordPress itself.
This plugin, called Enable jQuery Migrate Helper, is not a fix. It is a temporary solution to give your plugin and theme authors time to update.
If you get warnings, please check for updated versions of the plugin or theme that generated the warning. There will very likely be one you can install. When you have updated your plugins and themes, and there are no more warnings, please deactivate Enable jQuery Migrate Helper.
You are currently using a legacy version of jQuery. It has no support and doesn’t receive security updates. Please upgrade as soon as possible.

Second:

jQuery Migrate Helper — Warnings encountered

This page generated the following warnings:
https://southantrimvox.co.uk/wp-content/themes/Newspaper/includes/wp-booster/wp-admin/js/tagdiv-theme-plugins-setup.js: jQuery.fn.load() is deprecated
Please make sure you are using the latest version of all of your plugins, and your theme. If that is the case, then you may want to ask the developers of the code mentioned in your warnings to update it.

Thanks,
Naomi