procedure InitializeWizard;
var
  UserAgent: string;
begin
  ITD_Init;
  // Firefox user agent
  UserAgent := 'Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Firefox/31.0';
  ITD_SetOption('ITD_Agent', UserAgent);

  ITD_AddFile('http://download.microsoft.com/download/1/d/b/1dbee406-9b5f-48c5-b901-dd1a3f3c4669/Merlin.exe',
    ExpandConstant('{tmp}\Merlin.exe'));
  ITD_DownloadAfter(wpReady);
end;