Historically, changing the language of AutoCAD required a complete uninstallation and reinstallation of the localized version. AutoCAD 2016 utilizes a "Zero-Day Localization" strategy.
For more information on AutoCAD 2016 language packs, including system requirements, installation instructions, and troubleshooting tips, visit the Autodesk website. You can also check out online forums and communities, such as the Autodesk AutoCAD forum, to connect with other users and get help with any questions or issues you may have. autocad 2016 language packs new