Me again, this one doesn't regard GTA V, but it's similiar. I tried doing the same with Skyrim DLC-s, and I get this error.
http://i1317.photobucket.com/albums/t624/marinbosnjak91/greska2_zpsb8fcb598.jpg
I did everything same as with GTA V.
Well, I transfered it with Horizon now though.