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Hi,

Do you mean AutoCAD 2014?
Here are the links to all Service Packs for it:

SP1- This update resolves compatibility issues on the new Mac OS X Mavericks, as well as the issues that have been reported while using the software on the latest versions of Mac OS X Mountain Lion. It also resolves problems reported by the Customer Error Reporting (CER) utility and other general problems identified after AutoCAD 2014 for Mac was made available.
http://knowledge.autodesk.com/support/autocad-for-mac/downloads/caas/downloads/content/autocad-2014-...

SP2- This update resolves critical issues for AutoCAD 2014 and AutoCAD LT 2014 on the Mac OS X Mavericks, and improves the stability.

http://knowledge.autodesk.com/support/autocad-for-mac/downloads/caas/downloads/content/autocad-2014-...

SP3-This update resolves compatibility issues for AutoCAD 2014 on the Mac OS X Yosemite, and improves the overall stability.

http://knowledge.autodesk.com/support/autocad-for-mac/downloads/caas/downloads/content/autocad-2014-...

You need to install them all from the 1-st to the 3-rd

Maxim