Download Upgrade Version Reverts to Trial Version

I downloaded and paid for the upgrade version of CorelDraw X6 because I have X3,X4 and X5.  I have installed it already but I went to reinstall on my desktop PC as I wiped my hard drive back to factory state, CorelDRAW no longer gives the upgrade option.

On start up it gives the following message ( see below ) as a 30 day trial.

Any Ideas ?