RESOLVED - Reconnecting to Professional Plan

I've just done a completely fresh install of v10.0.0, including a new UNA key.  I can access the App Store OK but my recently purchased Professional Plan is "pointing" to the previous install key.  I've tried a reset of the Professional Plan - no luck!

So how do I RELINK my professional plan to my site.  I only have a single site as per the Pro licence - can't see where to set the new key.

Thanks :)