Thank you for the following up. I have downloaded the software and tried. But it seems that every time I tried it stuck at some point. Could you help me to see what's the problem? I am not sure if my DXF file is too large (600MB). Could you kindly help me to take a look?
Actually your file is fine, however there's a few tricks you can do to speed up the conversion.
1. During DXF Import options, make sure you check the option to Flash Round and Rectangle shapes. A flash is simply a center point and shape to use can be 1/360 less data than a circle.
2. Your logo is not closed and continuous. It needs to be cleaned up to properly convert to GDSII. Please see our DXF Conversion Guide (section 3), https://www.numericalinnovations.com/pages/dxf-dwg-conversion-secrets-for-gerber-gds-ii-odb-etc
3. To really speed up your conversions use MInserts in the DXF for shapes that can be Step and Repeated.
Note: I noticed one hexagon shape placed way out in the lower / right corner of the DXF. I assume this is a mistake and should be deleted.
Here's a tutorial movie showing me convert your DXF to GDSII using ACE, https://numericalsoftware-update.s3.amazonaws.com/tutorials/2018-03-10_13-52-52_DXF_GDSII.mp4
Thanks again, and please let me know if you have any other questions.