If it doesn't work check the addon folder in Appdata/Roaming/Blender Foundation/2.80/scripts/addons is called blender-rigui (latest release) Addon is very much WIP ...
We also have video tutorials to get you started: Intro to Video Editing with Blender's VSE, a general introduction to Blender's VSE. Power Sequencer Workflow tutorial, a video dedicated to the add-on.
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