hello! I'm working with the italian version of draftsight free version. I have a Mac with the operation sistem Mac OS X, Version 10.6.8, and can't update. I always have been careful to update the free account on expiry but, suddenly, opening Draftsight i receive an error message: Questo prodotto non ha licenza o è scaduto. (This product is not licensed or has expired.). I can't use the new version of the app, and can't install again the old version. How can I use the program? Thank you very much in advance for your help Monica.