In Vivado 2014.1 or later, the installer can be re-launched to add to an existing installation in order to add device support or design Tools.
This is also a way to upgrade the Vivado edition to a more complete edition.
There are a number of ways to launch the installer to add content.
Once the installer has opened, the selections are prepopulated with the currently installed Tools and devices.
Select the new options which you wish to add to the install and then click Next.
Note: There is no option to uninstall only parts of an install.
During an "Add Design Tools or Devices" install, the post "Installation Options" may only be completed if additional devices or tools are selected.