Mac users interested in Autocad 2008 version generally download:
View, edit and share your design files with AutoCAD® WS for Mac® app. AutoCAD® WS for Mac® is a simple and free* CAD application that enables you to view and edit DWG™ and DXF™ files. Like the popular AutoCAD WS mobile app, AutoCAD WS for Mac app...
Create and modify 3D models and 2D sketches on your Mac. Generate 2D layouts, enable real-time visualization, collaborate on your projects with other users and store your designs in the cloud to access them from any device. Import files from other Autodesk programs in SAT, STEP, DWG and Autodesk Inventor formats.