Than, if you migrated to the new SSD everything from your old hard drive, you need to reset AutoCAD standalone license by trashing "FLEXnet" folder which is inside "/Library/Preferences/FLEXnet Publisher/" folder.
Look at this topic:
http://forums.autodesk.com/t5/autocad-for-mac-general/cannot-open-autocad-lt-2013-on-brand-new-mac/m...

Maxim