Atmel Data Visualizer is included as part of the Atmel Studio installer, and can be run either as a Studio extension or in standalone mode.
Kits supporting Data Visualizer functionality include a shortcut to the extension on their start page in Atmel Studio.
If the standalone version of Atmel Data Visualizer has been installed, look for the shortcut in Windows® start menu. The standalone version is available for download from gallery.atmel.com.