Looks like it's broken because of the beatsaver migration... the cmd prompt closes automatically after I select the amount of songs I'd like to download.
There were some changes to the BeatSaver API that broke the tool. I've updated the tool to fix those issues.
Get Beat Saber Song Downloader/Installer
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Try launching from the command line so that you can see the error. Usually the errors people run into are either permission errors because the script doesn't have perms to access the BS folder (usually because it's a different drive) or file not found errors because the path to people's BS directories is wrong. It works fine for me and many others atm.