When your SWx operator Save As type ACIS (*.sat) make sure that Options are set to v7
or
Download free Inventor LT from http://labs.autodesk.com to open the *.sldprt and convert to dwg yourself (Applications>AEC Exchange>Save As DWG solids)
or
zip and attach the file over here and ask someone to convert it to DWG for you http://discussion.autodesk.com/forums/forum.jspa?forumID=78
-----------------------------------------------------------------------------------------
Autodesk Inventor 2019 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional