I have tested several download manager. I found free download manager simple, powerful and comfortable. It simply resume download if we change download link to another server. download can be controlled from remote. and simply you can download files directly from your ftp of your site and much more!
However still I need some feature I couldn’t find them at any download manager. So I wrote a email for Free Download manager to add that. Hopefully we see it soon 
here is my email and requested feature to them.
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