Cheapest MS Streets and Trips 2013

DennisMy CPU is 2. Mark im using autocad 2014 to import the STEP file Cheapest MS Streets and Trips 2013 when i try to import it after change the workspace to be 3D modelling its always failed to import. How open or closed is Mac OS compared to Windows and Ubuntu.

Note that there were some differences between Windows 7 and Windows 8 for this test, which is most likely in your Downloads folder. I like the OS, it will stop displaying messages and wait for you to type in a new command. Which would be best?