"Need more Sources" means that the host(s) of the file isn't online, or has moved/renamed/deleted the file you're trying to download.
If the file had many hosts (20/30 and up) you might face a faked file you'll never be able to download.
You can either wait and see whether the host(s) get back online, or research the file under the "All Types" tab to find that file version offered by less than 20 hosts.
