The link is referring to you having an Enterprise license for PDQ Deploy. Advanced subscriptions have been merged with licenses and are now called Enterprise. There's a different license key associated, and we didn't start e-mailing them out until shortly after you got your updated one.
An Enterprise license doesn't yet give you any additional functionality unless you have more than one user, but that will change in future releases. For now, though, you can put in the Enterprise license to make the link on the bottom go away. I'll have the new license sent to the technical contact on your account.