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Link above.
Since this is a rewrite of the code base running the downloads I'm at the mercy of the forum software developer. They are aware of the problem and a fix may come as soon as the next release but there are no guarantees. The other obvious solution is to turn your download manager off, uninstall it, or change to a browser like Firefox which doesn't have a download manager installed in the stock distribution.
Again the problem isn't the downloads or how the files are counted but how the files are requested in ranges by browser download managers / accelerators.
Sorry for the hassle, again, but we're on it.
Your input is valuable, thanks for reporting this issue.
Erik