I've used Lightroom's Demo (free trail) for one month. During this month I've worked on some important photos of mine and when I tried to export them, I couldn't. Now that the free trail ended, I still cant export them and it drives me crazy....
Who knows how to help me??
If the free trial has ended, I don't think there is a way to export your photos from Lightroom. (Of course, you could pay for either Lightroom 6 or Lightroom CC 2015, and then you can export your photos).
What are your export settings?
What is the exact wording of the error message you are getting from the Export dialog?