You do not need to manually download the setlist.
The official public part of the setlist for YARG. This repository is here simply to keep track of updates, and to store other important information. If you want to actually play the songs, look in YARG! They should be there. Otherwise, download them from the launcher.
The YARG setlist IS NOT open source. Musicians gave permission to use these songs in YARG specifically. Everything must be used exclusively for YARG. Musicians could take action against you if this is not followed.