Community
-Open Control Panel and go to Programs.
-Select Revit and select Uninstall/Change
-Select Add and Remove Features and select the content libraries you want to install.
It is important that you have an internet connection (content is downloaded during the installation process). Also firewall might be blocking downloading
Also check knowledge.autodesk.com. If you do a search on "templates" you porbably will find articles suggesting possible solutions
Louis
Please mention Revit version, especially when uploading Revit files.