For more than two download simultaneously on Internet Explorer :

   1.Open Registry Editor.

   2. In Registry Editor, navigate to the following registry key:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings

   3.On the Edit menu, click Add Value, and then add the following registry value:

          "MaxConnectionsPer1_0Server"=Dword:0000000a

          "MaxConnectionsPerServer"=Dword:0000000a



          You can change 0000000a to any other value as long as it's hexadecimal.

 4.Close the registry editor.



Now enjoy the multiple downloads.