It is tricky to properly test on the 'main' branch since this version is not registered yet in plugins directory and does not have new plugin notifications. You will need to modify the code to test it. Make sure to purge caches before testing (this patch modified the JS files) Login as admin and go to Site administration>Plugins>Plugins overview Make sure you can see the links "All plugins" and "Additional plugins", you should see the "Additional plugins" even if you do not have any add-ons, then the number in the badge will be "0" Install some additional plugins from moodle.org/plugins but not the latest version , for example https://moodle.org/plugins/local_moodlecheck/1.3.0-deprecation-begins/31312 Return to the "Plugins overview" page and make sure you can filter by the additional plugins or view all plugins, filtering works in the JS Remove the folder local/moodlecheck and run upgrade script Return to the "Plugins overview" page and make sure that you can now see "Missing plugins" link and you can filter and view only missing plugins. Leave the "Plugins overview" page open in the browser Add code for another plugin, for example https://moodle.org/plugins/local_codechecker but do not run upgrade Purge caches and refresh the "Plugins overview" page Make sure that you see a "To be installed" link, you can click on it and filter the plugins that need to be installed Either install this plugin or remove the code, otherwise you will be redirected to the upgrade page later Checking for updates Add back the code for local_moodlecheck of the previous version, run upgrade Edit the version.php file and change the $release and $branch to previous branch, for example $release = '4.4.3 (Build: 20240712)'; $branch = '404'; Run scheduled task sudo -u www-data php admin/cli/scheduled_task.php --execute=core\\task\\check_for_updates_task Return to the "Plugins overview" page Make sure you can see the link "Available updates", click on it and filter by the plugins that have updates Make the folder local/moodlecheck writable chmod -R a+w local Return to the "Plugins overview" page Make sure you can see the "Install available updates" button Install updates, make sure it works fine Uninstall add-on plugin from this page, make sure there are no errors Remember to revert changes to version.php