So, I'm not able to test it by myself at the moment, but I just received this message from XBox support:
So it seems Microsoft fixed the problem with GFWL and now you should be able to download your games.
Hi again. Are you able to try Fable 3 through GFWL once more? The issues with GFWL should now be resolved. Please do let us know how things look on your end! ^AD
So it seems Microsoft fixed the problem with GFWL and now you should be able to download your games.