Send email to all administrators when update (WordPress or plugins) are available.

Noted That:

To install correctly this zes-admin-update-notification.zip.
Fisrt Download the zes-admin-update-notification.zip to your computer
Extract/Open zes-admin-update-notification.zip to Your Computer.
Then, Find readme.txt file inside zes-admin-update-notification.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "zes-admin-update-notification.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "zes-admin-update-notification.zip" Downloaded plugin from your computer, Where you downloaded zes-admin-update-notification.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Ze's Admin Update Notification" folder is added on left sidemenu. Now, Click on "Ze's Admin Update Notification" folder.

Noted that: If you do not see "Ze's Admin Update Notification" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Ze's Admin Update Notification Configurtions and Settings or How to work "Ze's Admin Update Notification" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Ze's Admin Update Notification" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Ze's Admin Update Notification
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
Installation is, as usual : Upload files to your `/wp-content/plugins/` directory (preserve sub-directory structure if applicable) Activate the plugin through the ‘Plugins’ menu in WordPress If use WP Security Scan plugin, comment out the line where there is : `add_action("init", mrt_remove_wp_version,1);` in `wp-content/plugins/wp-security-scan/securityscan.php`

Installation is, as usual :

Upload files to your /wp-content/plugins/ directory (preserve sub-directory structure if applicable)
Activate the plugin through the ‘Plugins’ menu in WordPress
If use WP Security Scan plugin, comment out the line where there is : add_action("init", mrt_remove_wp_version,1); in wp-content/plugins/wp-security-scan/securityscan.php

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Reffered: https://wordpress.org/