Sofortbild v1.2.9 is now available as download on the website. It finally fixes the D800(E)/D600 issue and also adds support for the D5200.
I am having some difficulties submitting the same version to the Mac App Store. That is why the version on the Mac App Store is older.
PS: I still get a lot of requests for D3X00 support. Nikon does not provide camera drivers for those models. As long as Sofortbild relies on these camera drivers, I won’t be able to add support for these models. Sorry about that.