Do you mean for one file or for different files. If the first, I do not know of a way... if you only get 2 hosts it probably means that other indicated hosts are not available for some reason.
If the second, in which case a third attempted download would be "queued" go to options or preferences> downoads > possibly basic > slots. (I've just closed down so I can't check) ... and increase the number .. to say 5 no more to start with.

I hope this helps

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