While upgrading to 12.0.18 from 11.5.30

[Ryan11433]

While it is upgrading and I login into the control panel I see "Error: The license key is invalid. In order to use Plesk, you need to obtain and install a new valid license key.
You are trying to use a license key created for another version of Parallels Plesk. Contact Parallels sales representatives to obtain the proper license key." What should I do and how am I getting to the sales representatives?

UPDATE: Click Retrieve Keys and it fails.

Details:

SQLSTATE[HY000] [2002] No connection could be made because the target machine actively refused it.

---------------------- Debug Info -------------------------------

Of course I have finally gotten the ticket filed to the support team at the help desk at support.parallels.com hopefully they can resolve this issue.

Another Update: They responded and is now fixed by a newer key file.