Use any of the download managers mentioned above, but remember the basic points;
1. Keep only one active downloads. Since this reduces the strain on your network.
2. Enable segment spitting. i.e. downloading by parts
3. If there are mirrors present then enter them and check the server speeds. Use the fastest one. Usually speeds such as 120 % are shown in Free Download Manager, if the servers are free.
4. Use HTTP mode it available
5. Make your Download Manager recognize you as some thing else other than a browser or download managers name, usually busy servers limit browser and download managers speed.
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