DraftSight Pro Trial

Hello, I activated the trial of Drafsight Pro not long ago, however every time I launch a DWG I now have the activation window.

How do I go back to the free version, and remove this activation window?

Thank you very much and have a good day!

Hello

I think my tutorial can solve this problem:

http://www.lynkoa.com/tutos/3d/probleme-d-activation-draftsight