If you've installed the optional templates that come with SlideShowPro Player for Lightroom, but they don't appear in the Template Browser of Lightroom, here are a couple of things to try.
First, check the Installation instructions to make sure that you moved the "Web Galleries" folder to the correct location.
If the above checks out, open the Preferences dialog in Lightroom and click on the "Presets" tab. Click the "Show Lightroom Presets Folder..." button to open the presets directory for your current catalog. Chances are it will open a different presets directory than the one you installed the templates to earlier. You can either install your templates to this directory instead, or toggle-off the "Store presets with catalog" checkbox next to the aforementioned button in the Preferences panel so that all your catalogs share the same presents directory.
If none of the above help, click on the "Contact" tab at the top of http://slideshowpro.net and we'll try to assist.