Exceeded Maximum Number of Activations

I have been using Windows 10 Inside Preview and rebuilding my system with every new build made available. AND happily install CorelDraw X7. UNTIL yesterday when I get the message "this serial number has been used too many times to activate."

Reading through some of the forums I should have uninstalled the CDX7 before rebuilding my PCs and hence reducing the number of Activations.

I am only using the s/w on one desktop PC.

There must be a way to deactivate all old versions so that I install it again and Activate - similar to the way iTunes does it.

Please help - I have 29 days to go!

J.