I got the same problem with The Storyteller dlc. After unpacking, installing and veryfing, I got an errormessage : failed to install DLC. I am playing on win10 and it is the same with running as admin.
The Galactic Detour installed without problems for me, but in the dlc folder said it version: 1.1.0. I installed the 1.1.1 file. So I cannot tell, if the fix is installed.