The installation, activation, and registration of the Maya with Softimage software on a Windows OS follows the same procedure as for other Autodesk software products.
See Maya System Requirements, Softimage System Requirements, Maya Release Notes, Softimage Release Notes and Certified Hardware.
The default installation path for the Maya 2016 product on a Windows OS is: C:\Program Files\Autodesk\Maya2016. The default installation path for the Softimage 2015 product is: C:\Program Files\Autodesk\Softimage2015.
To install Maya with Softimage in a language other than the default language, follow the instructions in the installer.
See also About Languages and Language Packs.
To install Maya with Softimage on a Windows OS, see Installation Workflow.