Using Windows 7. The first time I downloaded DS all seemed to work well. Thought there was a newer version so uninstalled and reinstalled.  Since that time, have been unable to open dwg files directly, can only open by opening DraftSight and then File > Open and browsing to the correct file. Have repeated uninstall/reinstall with same result. Don't see the Activation step upon the reinstalls and am stuck.  Suggestions?