After spending valuable time trying to figure out what was happening with my apparently "expired" free version of .NET Reflector, I happened upon this forum.
I used .NET Reflector because it was good, and more importantly, free. I may have considered upgrading to a paid version if I felt it would provide me with better support and/or new or improved functionality.
However, there is no chance of that happening now. The wise decision would have been to release a perpetually-working free version and then restrict new versions to paying customers.