Autodesk has released for download Service Packs to make AutoCAD 2013 for Mac, AutoCAD LT 2013 for Mac, and AutoCAD 2012 for Mac compatible with the latest version of Apple’s OS X 10.8 otherwise known as Mountain Lion. There are several other fixes included to improve the products stability and performance that have been reported to Autodesk Support as well as sent in using the CER reports.
AutoCAD 2013 Service Pack 1 (Mac)
AutoCAD LT 2013 Service Pack 1 (Mac)
AutoCAD 2012 for Mac Service Pack 3
Please note the important details from the AutoCAD Support blog “Without a Net” A Mountain (Lion) of Service Packs
“New Apple guidelines require that software packages installed on OS X 10.8 (Mountain Lion) meet certain security standards. These restrictions mean that you may be unable to do a fresh install or re-install of your existing AutoCAD for Mac products on OS X 10.8. In that case, depending on your product, you should either download the full version of AutoCAD 2012 for Mac or download the trial Mac versions of AutoCAD 2013 or AutoCAD LT 2013. These downloads have been updated to include the latest service packs and conform with new Apple security requirements.
The service pack for AutoCAD LT 2013 is not for the AutoCAD LT 2013 purchased from the Mac App Store. That version will receive the new updates directly from the Mac App Store when it becomes available”