When you install the plugin you will see a download key is missing message in the Joomla dashboard.
You need to use this Download Key to enable automatic updating of our extensions. Our system checks if you use a valid Download Key and if you have an active subscription.
You can find your personal Download Key on our website: https://www.joomill-extensions.com/account/my-downloads
Copy the Download Key and paste it in the Edit Update Site screen.
After you are done, press the Save and Close button.