To download all objects using wget:

wget -r -H -N --cut-dirs=4 --include-directories="/v1/" "https://swiftbrowser.dkrz.de/public/dkrz_713c5812-40a6-4d9c-a938-50cfce20c44f/CoCO2_VPRM_fluxes_2021/fluxes_2021_4?show_all"