It is an amazing plugin. I too am having the same issue with the serial key.
We're fixing it right now! Should he updated within the hour. Thanks for the heads up!
I just uploaded an update. If you download the most recent version and replace your old one, you should only have to enter your serial key one more time. Thank for your patience, and let me know if it works!
I just downloaded it and replaced the original file. It didn't need the serial key again it looks like, but I will let you know how it all goes.
