dawnguard Dawnguard not working, help!

I had bought Dawnguard the day it came out, and I had beaten both factions. But since yesterday, it has been saying that the files for DG was no longer there, even though it was still in the storage space. I tried deleting it and download it again, but it still says the same thing. Any idea on what to do so I can still play it on my other files?

same thing happening to me, ben playing dawngaurd since it came out. moved xbox to a different house with no internet, and now it says cant load certain items etc. and dawngaurd wont show up in my add-ons even though its on my hard drive. idk if its cuz xbox live isnt connected or what. was playin last night perfectly fine.

just click the link click skyrim then go to the list of questions and a few questions down it says 'dawngaurd wont load properly' or sumn to that effect. adios!