hi,
i cant reproduce the problems with DConvertCon.exe - it works with your dxf file here. (version 1.0. Copyright 2002, 355.840 Bytes)
The import error is localized: there are some hatch objects (“*X” BLOCKs) as members of other BLOCKs and the script could not manage it correct. I’ve made a patch and will offer it for download soon.
Quick solution for now: activate “n” option next to “Block”-button for import all noname / hatch blocks:
1937 objects imported from model space in 631.8392 sec. -----DONE-----
compare to “ignore noname blocks” variante
908 objects imported from model space in 44.6889 sec. -----DONE-----