I'm still encountering installation problems. I bought Songs of the Rus from the Paradox website, and then attempted to install via Steam but although it seemed to download fine, I got the "Steam failed to Install Crusader Kings II: Songs of the Rus (App configuration unavailable" error. Please help. It is not showing up when in the list of installed DLCs when I start up CK2. I've been encountering similar problems with other DLCs I've bought recently (same error message) though they've ultimately installed.