VTK 6.3.0

I am trying to build ITK-snap which has VTK as a pre-requisite.BuildingITK-SNAP. The version recommended is 6.3.0, but I can’t find a download. Can anyone help ?

Thanks in advance
Colin

git clone https://gitlab.kitware.com/vtk/vtk.git
cd vtk
git checkout v6.3.0

good luck, 6.3.0 is very old.

Thanks, advice appreciated!