Which templates are you talking about? Movie Menus? InstantMovies? Video Collage?
Most templates on a Windows 10 machine are located inC:/PROGRAM DATA/ADOBE/PREMIERE ELEMENTS/15.0/ONLINE/DVD TEMPLATES/ALL_LANG/[Category}]
You will need to enable Show All Files to see them. And many templates are not downloaded to your computer until the first time you use them.