Be extremely cautious of any third-party site claiming to have an "exclusive" Italian crack or pack for the 2013 Mac version. Since Autodesk never produced one, these files are often wrapped in malware or are simply the Windows version repackaged to trick users. For legitimate downloads and updates, always stick to the official Autodesk Support site to use in your current English setup?
"Subject: Inquiry regarding AutoCAD 2013 Mac Italian Language Support
By following these steps, you should be able to successfully install and use the Italian language pack for AutoCAD 2013 on your Mac.