RobotGet is a tool designed to be able to download files from the web based on a predefined HTTP formula. You can assign various HTTP formulas and diverse variation parameters, running them in each particular necessity case. There is a specific menu option to add new variables and define their type (whole numbers or characters).
Another possibility is to add new download links to your list for every viable. RobotGet is a completely free tool that only needs less than half a megabyte of space. In summary, a different download manager, flexible, and one that lets you do things that others wouldn´t.