graphs and networks – How can I use the legacy version in TreePlot in Mathematica 12.0 and later?

In other places on StackExchange, I read: “In versions 12.0, TreePlot is changed substantially, and the legacy TreePlot is available under the name GraphComputation`TreePlotLegacy“.

How do I go from this to actually using the legacy package?

Needs["GraphComputation`TreePlotLegacy"] gives an error.

I have a beautiful TreePlot created 6-7 years ago. Doesn’t work now.