There seems to be problems with
Fallout 3's latest DLC,
The Pitt which was suppose to be released today. I did download it but mine might not work. I'll know in a few but the
DLC has now been pulled due to some corrupt file. Hopefully, it won't be too long before it gets put back on there so we can all enjoy traveling to Pittsburgh in search of the mutation cure.
-Update- When the fix is out though, you'll have to redownload it. This message below is from the staff replying to the Bethesda Blog post about the DLC.
When the new version is available, you’ll want to delete the Pitt DLC you currently have and redownload it. The way LIVE works, there’s no cost to redownload.