VTK master has a recent change so that you can write out either VTK 4.2 or 5.1 formats:
https://discourse.vtk.org/t/can-we-write-out-the-old-vtk-4-2-file-format-with-vtk-9/5066
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VTK master has a recent change so that you can write out either VTK 4.2 or 5.1 formats:
https://discourse.vtk.org/t/can-we-write-out-the-old-vtk-4-2-file-format-with-vtk-9/5066