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Go to “File”→“HTTP/FTP Batch Download”; you will open a Batch Download dialog. This option is convenient for you to download several files at the same time. There are several ways to open Batch Download dialog and begin HTTP/FTP tasks batch download.
Take BitComet official page for example. Suppose you want to download BitComet from version 1.10 to 1.14. Right-click and copy the two versions' download URLs. And we know they are respectively http://cn.bitcomet.com/achive/BitComet_1.10_setup.exe and http://cn.bitcomet.com/achive/BitComet_1.14_setup.exe.
BitComet will automatically list all URLs between the two versions, in the following blank field. Look at the following snapshot: