at the beginning of the post it led me to:
module info/features.

and there it says:
Please Note: This module does not automatically add mappings for existing Categories/Products/Manufacturers/EZ-Pages - if the site has existing Categories/Products/Manufacturers/EZ-Pages, they'll continue to use the standard Zen Cart dynamic URIs, until a URI has been entered or auto-generated for them, by editing the respective Category/Product/Manufacturer/EZ-Page in the admin.

This means going in and editing every Category/Product/Manufacturer/EZ-Page for which a static URI mapping is desired.

so it is telling me I have to do that manually, but does not tell me how.