Not sure if this'll help with the Gronemayer issue, but I have downloaded the "install all" file from that site to a laptop or PC, then dumped the file onto a miniSD card via a card reader, put the card into my n810 then clicked on it and it installed all the repo details into the Installation Manager.
(I had to resort to this workaround a while ago when my n810 baulked at even opening the Gronamayer site, so I couldn't add a single repo, let alone many)
Hope this helps.