You obviously didn't see the Sticky at the top of this section. Manual http://www.limewire.com/english/content/userguide.shtml

There are the downloads.dat & downloads.bak files in the incomplete folder. These should never be touched!!!

Check to see if this is your problem & check the options discussed: License requirement (click on link)

If the files aren't even going into your download window, then they must be either fake or else, you need to change the setting for downlding license of files.