You must be connected to download Avid/Pinnacle Studio 16 thumbnail buttons
Thumbnail buttons for DVD menus library
Select all the thumbnail buttons you want to import in Avid/pinnacle Studio 16, then click on Download button
This will generate a .zip file using your connection pseudo for file name. Download this file into C:/Users/Public/Documents/Pinnacle/Content/Buttons folder and unzip it using 7-zip with the Extract here option.
Wait a few seconds for the automatic library update process and your new buttons will be available for DVD menu edition !
For additionnal explainations about thumbnail buttons, see this tutorial !