To check and refresh your license key go to "Home > Maintenance > Subscription (1) > Licensing" (2).
You can see the active "Installation Key" (3), the "Status" (4) of your license and other registration details.
To refresh your license click "Refresh License" (5).
When your license is successfully refreshed, you receive a success/confirmation message. Return to your licensing page to check the details of your new license.
Note: in case you can't complete this operation please check this article.