Cannot find Curved Planar reformat Module in the Extension Manager

Hi Everyone, I am here again.
I am trying to add a centerline into my animal heart model in 3D Slicer (Win. 4.11.20210226) as the tutorial New vessel branch extraction module for 3D Slicer - YouTube. But I cannot find the “Curved Planar reformat Module” in the Extension Manager. Does anyone know how to make it?
Thanks in advance and have a lovely weekend.


The module is in the “Sandbox” extension.