Install
This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.
Install straight from GitHub with WP-CLI:
wp plugin install https://github.com/ppprakhar/wp-409-conflict/archive/refs/heads/master.zipNo built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.
wp-409-conflict
Solve WordPress 409 Conflict issue ( major-ly faces in case of Contact Form 7 and after update wordpress version 5.3)
Download this plugin and put in wordpress plugins directory and activate.