Reload the game, it's a techical hitch. You should get a broadcast within a minute.
I've done that several times and still nothing.
I'm on the PC version, by the way.
I had to cut the bsa and esm files for the dlc and then paste them in c:program files/fallout 3/data. Then I had to run the fallout launcher, click on data files, and check all the dlc and the main game. directions stolen from gamefaqs:
1) DL the DLC from Games for Windows Live.
2) Once downloaded and installed, go look into this address in your PC: (C:\Documents and Settings\User Name\Local Settings\Application Data\Microsoft\Xlive\DLC). GFWL keeps the DLCs hidden here. If you can't find it, use the search function and tick the option to search for hidden folders as well.
3) Look for these 3 files (Anchorage - Main.bsa, Anchorage - Sounds.bsa, Anchorage.esm). You can use Search function directly to look for them instead of Step 2 above if you want (remember to tick search for hidden folders too!).
4) Copy and paste these 3 files into your Betheseda Softworks\Fallout 3\Data folder (you'll notice that there's other similar file types here, ie: .bsa, .esm). 5) Now click your Fallout 3 Launcher icon, go to Data Files. You will notice 2 .esm files, which are Anchorage.esm (unchecked) and Fallout 3.esm (checked). Now check Anchorage.esm as well and press OK.
6) Now launch and play your game and load your latest or favourite save. Wait a few minutes (preferably outdoors), and you will be informed of a new signal in the Capital Wasteland (Outcast Distress Signal), and the quest "Aiding the Outcasts" begins when you hear the details in the radio broadcast. Now you can play Operation: Anchorage without GFWL needing to be logged on to play it!
and yes, one would think that this issue would have been solved by the second dlc pack.
PC gaman
