I received my TFP upgrade to FP 11 last night and proceeded to try and activate the trial I had installed. I could not get the program to activate so I uninstalled the demo and did a clean install from the DVD. I was then able to get the program activated. It might have been the fact that this is an upgrade that I had to do this but if you have trouble activating the demo from a purchase and you have the DVD try what I did.
Larry