For some Autodesk products, you can select the product language at the time of installation, using this drop-down menu on the installer:
Language Selection Menu
If the language you want is not on this menu, your available options vary by Autodesk product. Many products, such as 3ds Max, Inventor, and all AutoCAD-based products, use language packs to support additional languages.
These conditions apply to language selection:
A language pack is a software module that can be added to an Autodesk product to change the language used throughout the user interface and the documentation. A single instance of the product software can support multiple languages by adding language packs. Each language pack is matched to a specific Autodesk product, and includes an installer. You must install the Autodesk product before installing a language pack. Each installed language pack creates a separate icon on the Windows Start menu, such as "Inventor - French (Francais)" that you can use to start the product in that language. Depending on your product, language packs may be available on the installation media or from a website.
A language pack installer provides an option to create a language pack deployment for a particular product. The language pack deployment can be installed on multiple computers, after the related product is installed, to add another language version.