Just Click and Drag it into Blender then restart blender

And then Tap the Ctrl Key (you have set in the Addon Preferences) the addon will replace the header bar with Tab Flows tabs bar

You will see a plus button in every Editors Header Bar when you click + A Popup will allow you to Select the Editor Type you want to add Tab for and Add as many tabs as you want and switch between them with one click. making blender even more easy to navigate