How to install ARD Mediathek?
ARD Mediathek is available in the official Kodi repository which is included by default in Kodi. You can install this addon by going in Kodi to System >> Settings >> Addons >> Get Addons >> XBMC.org Addons or Kodi.tv Addons
About SuperRepo and ARD Mediathek
SuperRepo does not maintain ARD Mediathek. We only provide an automated index for Kodi users to have easy access to ARD Mediathek and other addons for Kodi. We are not affiliated with the developers (AddonScriptorDE, membrane) and do not provide help for this particular addon.