static File installOrUpdateYouTubeDL() {
  File file = youTubeDLExecutable();
  if (!file.exists()) ret forceInstallYouTubeDL();
  pcall {
    /*if (fileOlderThanNDays(file, 7))
      ret forceInstallYouTubeDL();*/
      
    S newVersion = loadPage("https://rg3.github.io/youtube-dl/update/LATEST_VERSION");
    File versionFile = javaxCodeDir("youtube-dl/youtube-dl.version");
    if (!eq(newVersion, loadTextFile(versionFile))) {
      print("Found new youtube-dl version: " + newVersion);
      saveTextFile(versionFile, newVersion);
      ret forceInstallYouTubeDL();
    }
  }
  ret file;
}

Began life as a copy of #1006747