如何使用innosetup自动从Microsoft下载文件

Question

我正在使用InnoSetup工具下载器插件from here。 它可以在安装过程中下载外部Internet文件。 虽然它可以在许多情况下工作，但在某些情况下像这样：

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

它抱怨如下：

  

抱歉，无法下载这些文件。检查你的连接和   点击＆＃39;重试＆＃39;＆＃39;尝试再次下载文件，或单击   ＆＃39;＆＃39;取消＆＃39;＆＃39;终止设置。

我们可以使用webbrowser打开并下载：

http://download.microsoft.com/download/1/d/b/1dbee406-9b5f-48c5-b901-dd1a3f3c4669/Merlin.exe

为什么它不能通过itdownload自动下载？
怎么解决？

以下是导致问题的修改后的示例。

#define MyAppName "My Program"
#define MyAppVerName "My Program 1.5"
#define MyAppPublisher "My Company, Inc."
#define MyAppURL "http://www.mycompany.com"

[Setup]
AppName={#MyAppName}
AppVerName={#MyAppVerName}
AppPublisher={#MyAppPublisher}
AppPublisherURL={#MyAppURL}
AppSupportURL={#MyAppURL}
AppUpdatesURL={#MyAppURL}
DefaultDirName={pf}\{#MyAppName}
DefaultGroupName={#MyAppName}
OutputBaseFilename=example1
Compression=lzma
SolidCompression=true
CreateAppDir=true
ShowLanguageDialog=yes

[Languages]
Name: english; MessagesFile: compiler:Default.isl

#include ReadReg(HKEY_LOCAL_MACHINE,'Software\Sherlock Software\InnoTools\Downloader','ScriptPath','');

[Code]
procedure InitializeWizard();
begin
 itd_init;

 //Let's download two zipfiles from MS Agent  website..
 itd_addfile('http://download.microsoft.com/download/1/d/b/1dbee406-9b5f-48c5-b901-dd1a3f3c4669/Merlin.exe',expandconstant('{tmp}\Merlin.exe'));

 //Start the download after the "Ready to install" screen is shown
 itd_downloadafter(wpReady);
end;

procedure CurStepChanged(CurStep: TSetupStep);
begin
 if CurStep=ssInstall then begin //Lets install those files that were downloaded for us
  filecopy(expandconstant('{tmp}\Merlin.exe'),expandconstant('{app}\Merlin.exe'),false);
 end;
end;