Hello,
that version your downloading only works on windows your downloading the wrong one
.exes are windows OS
MACs have their own format
you need to download autocad for mac
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=15802859&linkID=15839490
or learn how to setup parallels or bootcamp so you can run native windows apps on your MAC
DarrenP
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Have you tried to load the native Mac version of AutoCAD?
I believe that you need to install something like boot camp and boot into the windows mode before using Windows applications like executables.