If you just want to download Youtube subtitles, you probably want to skip video downloads – this happens when you do “–skip-download”.
youtube-dl.exe --skip-download \ https://www.youtube.com/watch?v=CwmtkFPYXsg \ --write-sub --write-auto-sub -o ./'%(id)s' \ --write-info-json --write-description \ --write-annotations --sub-lang en