Where are the Conceptual Web Site Stencils

Hi, I have Visio Standard 2019.   I can download and open the conceptual webiste templates but they open blank as I am missing the stencils that they use.    Where are they located so I can download them.    Per Microsofts site  they are part of the visio that I have.   https://support.office.com/en-us/article/plan-your-web-site-with-visio-shapes-60d7aa38-8f2d-4d8f-8759-61285e64fae8

The Conceptual Web Site template opens three stencils:

• Conceptual Web Site Shapes  These shapes represent general content, such as pages, page groups, and related pages.

• Web Site Map Shapes  These shapes represent specific content, such as ActiveX controls, files, multimedia, and images.

• Callouts  These shapes annotate your diagram.