Motion Templates Missing
If you still do not see the plugin, you may be missing your appropriate Motion Templates folders.
Open a Finder Window.
Navigate to your MAC HD > User > (Your User) > Movies > Motion Templates

Locate your Titles / Generators / Effects / Transitions folders
If you do not have this set of folders, they will need to be created.
Create empty folders in the Movies folder named: Titles.localized, Generators.localized, Effects.localized, and Transitions.localized.

Then, reinstall the plugin.