I am a user of draftsight free version 2D since longtime. Recently I deleted the old version and installed Draftsight 2015 x64 SP3. After installing the new version, the program started normally without any warning or message. After a few days I was not able to start the program; When I try to start it seemed to launch normally but after a few moments it quited. After a few trial of launching it started, but I receive a message requesting to activate the software. I am not able to find how to activate it.

Ragip Keçik