I assume - somewhere - I have to provide a registration number. I have not changed my e-mail address, but the application certainly quit working as Pro (no warning). At this point... I do not remember how much I paid. But, I do remember purchasing directly from the LimeWire folks. I would assume there would be some type of Customer Support e-mail address or telephone number. But, I cannot find on on the screen. Any ideas would be appreciated. Thanks.