Establish multiple connections for downloading a single file.
Currently looking into this. Might be tricky keeping all Ketarin features intact in this mode, but we'll see how far we get with this method.
I also updated the subject, since Ketarin has always been "multithreaded".
Please try 1.8.6 beta 3: https://ketarin.org/forum/topic/3922-ketarin-186-b3/
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