Same here. “There was no license key requested.” error.
I already had the program from another giveaway (GOTD), so when i first started the program, it didn’t even ask for any registration,so i guess it automatically used the older GOTD license. But after cleaning all up (removing the old license), the second start, it said, that in order to use the full version, i need to register for the newsletter, so i did and got the error from above.
I’m assuming it (the error) may have to do with already being registered. If you don’t get the registration pop-up after running the program, you may already have it registered.
To check if it’s already registered, when you go to Help -> About in the program, it should say after License type: that it’s the Full version.