PC Beat Saber - 2 Ways To Install Playlists
If you're not sure how to install playlists, you can either download a playlist file from bsaber.com and drop it into your "playlists" folder or you can download playlists in-game using the "more playlists" button. If you don't see that button in the main menu, you can toggle which mods you see in the "mods" section.