When searching for a file, try to vary your searches. Search for the song title only. Then try another search for the artist only. Try using the all files or the audio files search, and try downloading files with only a few sources(less than 10). Have patience and try searching at different times of the day.
The network is being flooded with fake files to try to disrupt the downloading of copyrighted files. So it's probably one of these fake files that you've been trying to d/l. Good luck
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