The DLC appears to be region locked and they're verifying your ip to enforce it. that's my 2 cents.

i couldn't download in HK as well using my US gamertag. so i created a HK gamertag and am now dowloading it using this profile. I hope I can play it using my US gamertag when it's done. Just trying my luck here.

Anyway, the download speed is really really shitty ..... 15 mins gone and it's still 1%. looks like tomorrow only can play. anyway, back to Fable 2 for now.