computercourage

This plugin allows you to customize the WordPress update message shown when a new version of WordPress is available. This plugin is targeted toward web developers who want to provide support to their clients when updates are available, and prevent clients from accidentally breaking the site via updates. Developers can enter their contact information, and a personalized message to be shown when the update is available. Finally, developers can also determine which types of users see the upgrade message and which do not.

Custom WP Update Message

Customize and control the WordPress update message in the dashboard.

Shail Mehta

Plugin Can remove WordPress Version Update Notification, Remove Plugin Update Notification 
& Also Remove Theme Update Notification.

Remove Update Notification

Plugin , Theme, Wordpress Version Update Removal .

Custom WP Update Message vs Remove Update Notification