I down loaded and unpacked your dxf and was able to import it tp allegro with no issues. Here is how I did it :
1 - From the file menu select import dxf.
2 - When the dialog box opens click the browse button and select the dxf
3 - Select units : inches (we work in inches)
4 - check incremental addition
5 - click edit/view layers
6 - select the class and sub class you want. (I selected package geometry and assembly top)
7 - click ok, then import
In it came.
Here is the .cnv file that was created :
#This is the Layer Conversion File used for
#importing DXF data into Allegro/APD.
#CLASS! SUBCLASS! DXF_LAYER!
Hope this helps.