This plugin hasn’t been tested with the latest 3 major releases of WordPress

I am wondering the same.Considering it has so man active installations.

Looks like they are going to update the plugin.

The Ozz just posted a notice, in this forum, about beta testing for a planned update or new version (if those happen to be separate things).

See here: https://www.ads-software.com/support/topic/advanced-editor-tools-version-5-9-beta1-available-for-testing/

Sure would be nice to get this plugin updated, it is like a standard thing now in WordPress.

Thanks for the update @lospeso.
Going to wait till the Beta testing phase is complete and final update is available.