So... if anyone is trying to do what I just did...
When you want to use the latest version of KCFinder (directly from github or the website), do yourself a favor and copy the couch.php in the kcfinder/integration in the zip into the responding folder of kcfinder...
The Latest version still works perfectly fine but I had some issues "finding" the right version (after 3 hours turning out that the latest worked perfectly fine <.<) because somehow the session wasn't written correctly and while switching between versions it would work and then stop to work on the same revisions... took me some nerves but hey, on the other hand I could have just thought of that from the beginning
So really all you need is the kcfinder/integrations/couch.php.