Support for Leech is available from the publisher site.
Short description: Leech is a high-speed offline web browser for Windows that downloads web site content to your hard drive. It is a multi-threaded application which allows you to simultaneously "leech" multiple files from a server....
To speed up your downloads we recommend you use a download manager such as 
1. Drag&Drop for URL collection
2. Skin shades to choose from
3. Linear Browsing with web page access time
4. Multiple Browsing using tiled-windows
5. Tailored Browsing
6. Auto Browsing
7. Verbial Icons
8. Computer control from within browser
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