I have a nikon coolpix s610c camera and I can't find anything anywhere that help's. I can't download photos from it. Please help 
I had/have a problem with my Canon camera in DigiKam and it may be relevant to your situation.
My camera is correctly identified by digiKam when I connect, but I am unable to download or view photos. I discovered that in the drop-down list my camera is listed with an incorrect model number. When I select that incorrect number all works as it should and I can view and download as normal.
So it may pay you to check if your coolpix is listed as, for example, s601c, or some other variation. Hope this helps.