Downloading 'Data files'?

My understanding was that the data files are installed automatically by including the ‘-DGEANT_INSTALL_DATA’ option. Can any one please tell why Geant4 provides additional links to download the data files ( and how we are supposed to use them?

Some sites may not want to redownload the data for each individual build (the GEANT4_INSTALL_DATADIR option also helps with this).

Some sites may want to download the data files separately, using a dedicated high-volume data transfer method.

Thanks much for the explanation!

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