Your license key may need to be updated if you're recieveing the message, "Your license key is invalid - possibly an old license key" after your upgrade. To fix this follow these steps:
1.) Log into your client area
2.) Copy the license key for your domain
3.) Open admin/includes/config.php
4.) Paste the license key in the respective spot and make sure your changes are saved
You can also paste the license key directly into the application on the 'Application Settings' page. You may need to log out of the application and/or clear your cache for the changes to take effect if you use this method though.

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