Known issue,fix for me was deselect all DLC content from Steam games list library for Pillars of Eternity,(you do this by right click on "Pillars of Eternity" in games list and select "view downloadable content"), after you unticked all DLC boxes exit Steam,relaunch Steam and put a tick back in all the DLC contents,it should start the redownload with the correct contents installed this time,it was about 1.2gb for me for my Champion edition.
I confirmed by looking in the Program Files (x86)/Steam/ SteamApps then Common folder for Pillars of Eternity and all contents is there like map ,ring tones etc.