Save the *.zip file on your local PC in a temporary directory. Unzip the included *.udb file and save it either in the working directory of your Moldflow-release ( ..\My AMI x.y Projects\udb\.) or under the Program Files directory (C:\Program Files\Autodesk\Moldflow_Insight xy\data\udb\.), where xy is showing the name of your software release.
After starting AMI you can select the desired material via the menu Analysis/Select Material.