DXF files with version below AC1009 (DXF12) are not supported. This is because there is not enough documentation available for those versions. Users with files that old are kindly requested to export their projects to newer versions. In some cases it might also work to just replace AC1006 (or anything below AC1009) with AC1009 directly in the DXF.
This addon replaces the old DXF importer.
Written by cnd (Lukas Treyer).
It uses dxfgrabber - copyright (C) 2012 by Manfred Moitzi (mozman) (MIT license).
Review and some cleanup by mont29 (Bastien Montagne).