If you are reading this article, you are likely still running the old client, and are looking to upgrade to the new one.
You might have also received a yellow banner on your existing client advising of the upgrade. (See screenshot)
To upgrade, please take note of your existing URL setting in the current client, to be used in the new client. (You can also find this URL in the initial email we sent you when your account was provisioned)
To do so: