Windows

From powershell, run:

# Download ffmpeg/ffprobe dependencies from yt-dlp
curl.exe -L -o ffmpeg.zip https://github.com/yt-dlp/FFmpeg-Builds/releases/download/latest/ffmpeg-master-latest-win64-gpl.zip
tar -xf ffmpeg.zip
move "ffmpeg-master-latest-win64-gpl\bin\ffmpeg.exe" "ffmpeg.exe"
move "ffmpeg-master-latest-win64-gpl\bin\ffprobe.exe" "ffprobe.exe"

# Download ytdl-sub
curl.exe -L -o ytdl-sub.exe https://github.com/jmbannon/ytdl-sub/releases/latest/download/ytdl-sub.exe
ytdl-sub.exe -h