I am experiencing the same issue here. Though I am on 1195mb and it is hardly doing anything which is unusual considering I have always had reasonable internet speed and still currently have.
Unfortunately I can only add my story but not offer any answers to this
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I would also repeat the question:
How big is that one last file? Why does it take so long to download when everything else is running fine (connection wise).
Is it maybe that the server is having a busy time?