To download all objects using wget:

wget -r -H -N --cut-dirs=4 --include-directories="/v1/" "https://swiftbrowser.dkrz.de/public/dkrz_a88e3fa5289d4987b4d3b1530c9feb13/ReKliEs-De/Supplement/?show_all"

Name
Einzelbilder
Info
RCP26
RCP85