Hmmm, that's very odd indeed, have never heard of that particular issue before. We do have installers directly on our website, and if Steam isn't downloading for you then you might want to use our installer and install into the Steam folder. That's ludicrous of course, but if it refuses to download one file that may be causing the issues.
Which game are you referring to (Valley 1 or 2), by the way, and on which OS?
Hope that helps!