Jan Koch

Upon activation, this plugin uses the “automatic_updater_disabled” filter to prevent automatic updates from being installed. 
It does not offer configuration, not even an options page in WP Admin.
Simply install and activate the plugin to disable all automatic updates. Deactivate the plugin to re-enable all automatic updates.

Stop Automatic Updates

This plugin disables all automatic updates. No configuration needed.

simshaun

There’s not much to this plugin. It’s a couple barebones filters that turn off the plugin and theme autoupdate emails.
On WordPress 5.5.0, plugin/theme autoupdate emails are turned off regardless of whether or not they failed.
Since WordPress 5.5.1, emails indicating update failures are allowed through.

Disable Plugin Autoupdate Emails

Getting too many "plugin updated" or "theme updated" emails since WordPress 5.5? This turns them off.

Stop Automatic Updates vs Disable Plugin Autoupdate Emails