Encountering this issue today myself. Long-time user, paid & registered; was surprised at launch to see a "trial period is over" message. I located the confirmation / registration e-mail from when I originally purchased the software, but when trying to use the "Enter Serial Number" option presented by the dialogue box, the (valid and legitimate) name & SN pair was rejected as invalid.
Have submitted a help request via the website's contact form, but would love to find a way to solve this in a more expedited way if at all possible.
Have been totally satisfied with the software for years, this has really been the only bump in the road -- it just happens to be really untimely. Any help is appreciated.
EDIT: re-reading through this thread, it seems like what's being said is that this issue is being triggered by an upgrade to v1.10, is that correct? If so I'm confused on a few points, primarily whether, in the application's version update prompt, there had been any indication that unlike prior updates, this one was to be paid. (I don't object to the notion of a paid update, of course, but I don't remember there being any such indication, and in my case I would have preferred to hold off for a short time). Do users have the option to roll back to a previous version?