This maybe done by means of task based on URL template. It is very simple! For example, let us tune downloading of pictures with addresses printed below.
2. Input task name (1) - www.somesite.com and press the button "Next" (2).
3. Input URL template (1) - www.somesite.com/images/{1}.jpg. Instead of {1} number sequence will be put, which we will include in the list "List of substitutions" (2).
4. Press the button "New..." (1) and select necessary substitution - "Numbers" (number sequence).
5. In dialog "Numbers" (1) input the following values: "Min value" -1, "Max value" - 10, "Interval" - 1, "Number of digits" - 3. Press the button "OK".
6. Press the button "Test", to check correctness of input. In the opened dialog "URLs" must be list of addresses, which was printed at the top of the page.
7. Now, if you input address of the real site with pictures you can start downloading of images after pressing the button "Start Now!".