Yes, only AC2 and the official Shivering isles. Last patch of the game. German version, mod is also german version.
Are you sure the mod's files are where they are supposed to be? And when you install a mod, you need to "check" it to tell the game to run it. Run Oblivion and from the start-up menu, click "Data Files." You should click an "X" on AC2's mod file (sorry if you already know that).