I am having the same problem as Kathleen. I have multiple CAD files that I need to import, and with each I get a Teigha Library Error: 42 - Invalid File Version
I have X9 and the file version is 2013, so there should be no issues. I have attached the files that I am trying to import, in case any kind heart can get this to work!
x-as built-level 1plan.dwg
x-as built-level 2 plan.dwg
x-as built-sect-elev.dwg
x-as built-site plan.dwg
x-as grid.dwg