It's back up @ the MS Store on the XB1.
Downloading as we speak:
Destiny Game = 17.9 GB
Expansion I: The Dark Below = 9.5 MB
Expansion II: House Of Wolves = 9.5 MB
Collector's Edition Digital Content = 8.8 MB
Vanguard Amory Pre-Order Offer = 8.8 MB
:D
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Many of those file sizes are place holders for the real content.