Your user profile says it is the free version. That's why I mentioned it.
I'd then suggest loading the text file to a temporary file. Then you can create text object with txt_create and load the file with the list with txt_load or txt_loadw. Finally you can iterate over the text's string and download each individual file.
http://www.conitec.net/beta/atxt_load.htmThe iteration pretty much works like this:
int i;
for (i = 0; i < t->strings; i++)
{
STRING* url =(t->pstring)[i];
// Now download from url...
}