Cannot upgrade VirtualMinGPL to Pro

Just bought V10 lioence. Clicked the Upgrade to Pro button and got this message:
Creating Virtualmin license file ..
.. done

Downloading and installing modules ..

Installing virtual-server version 3.57 ..
.. version 3.582.gpl is already installed

Some errors occurred while upgrading your system to Virtualmin Pro. Please check the messages above for possible causes.

Logged out, back in, same message. How do I get the features I have just paid for please?

Status: 
Closed (fixed)