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пример:

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Код:

[Setup]
AppName=My Program
AppVerName=My Program v 1.5
DefaultDirName={pf}\My Program
OutputDir=.

[Files]
Source: compiler:Examples\MyProg.exe; DestDir: {app}

Code]
var
  WelcomeLabel1,WelcomeLabel2,FinishedHeadingLabel,RunLabel,
  FinishedLabel,PageNameLabel,PageDescriptionLabel:TLabel;
  RunMyProg: TCheckBox;
// процедура для запуска программы если отмечен чебокс
procedure CurStepChanged(CurStep: TSetupStep);
var
  ErrorCode: Integer;
begin
if CurStep = ssDone then
  begin
    if RunMyProg.Checked then
    Exec(ExpandConstant('{app}\MyProg.exe'), '', '', SW_SHOWNORMAL, ewNoWait, ErrorCode);
  end;
end;

procedure InitializeWizard();
begin
  WizardForm.WelcomeLabel1.Hide;
  WizardForm.WelcomeLabel2.Hide;
  WizardForm.PageNameLabel.Hide;
  WizardForm.PageDescriptionLabel.Hide;
  WizardForm.FinishedHeadingLabel.Hide;
  WizardForm.FinishedLabel.Hide;
// низнаю почему, но Hide не действует. Поэтому просто уменьшил размер
  WizardForm.RunList.Height := 0;
  WizardForm.RunList.Width := 0;

      WizardForm.WizardBitmapImage.Align:=true;
      WizardForm.WizardBitmapImage2.Align:=true;
      WizardForm.WizardSmallBitmapImage.Align:=true;

  WelcomeLabel1:=TLabel.Create(WizardForm);
  WelcomeLabel1.Left:=ScaleX(150);
  WelcomeLabel1.Top := ScaleY(15);
  WelcomeLabel1.Width := ScaleX(320);
  WelcomeLabel1.Height := ScaleY(75);
  WelcomeLabel1.AutoSize := False;
  WelcomeLabel1.WordWrap := True;
  WelcomeLabel1.Font.Color := clBlack;
// здесь можно поиграть шрифтом
//  WelcomeLabel1.Font.Style := [fsBold];
//  WelcomeLabel1.Font.Name:='MS Sans Serif';
  WelcomeLabel1.Font.Size := 14;
  WelcomeLabel1.Transparent := True;
  WelcomeLabel1.Parent := WizardForm.WelcomePage;

      WelcomeLabel2:=TLabel.Create(WizardForm);
      WelcomeLabel2.Left := ScaleX(150);
      WelcomeLabel2.Top := ScaleY(90);
      WelcomeLabel2.Width := ScaleX(320);
      WelcomeLabel2.Height := ScaleY(200);
      WelcomeLabel2.AutoSize := False;
      WelcomeLabel2.WordWrap := True;
      WelcomeLabel2.Font.Color := clBlack;
      WelcomeLabel2.Font.Size := 8;
      WelcomeLabel2.Transparent := True;
      WelcomeLabel2.Parent := WizardForm.WelcomePage;

  PageNameLabel := TLabel.Create(WizardForm);
  PageNameLabel.Left := ScaleX(25);
  PageNameLabel.Top := ScaleY(10);
  PageNameLabel.Width := ScaleX(300);
  PageNameLabel.Height := ScaleY(14);
  PageNameLabel.AutoSize := False;
  PageNameLabel.WordWrap := True;
  PageNameLabel.Font.Color := clBlack;
  PageNameLabel.Font.Style := [fsBold];
  PageNameLabel.Transparent := True;
  PageNameLabel.Parent := WizardForm.MainPanel;

      PageDescriptionLabel := TLabel.Create(WizardForm);
      PageDescriptionLabel.Left := ScaleX(40);
      PageDescriptionLabel.Top := ScaleY(25);
      PageDescriptionLabel.Width := ScaleX(475);
      PageDescriptionLabel.Height := ScaleY(30);
      PageDescriptionLabel.AutoSize := False;
      PageDescriptionLabel.WordWrap := True;
      PageDescriptionLabel.Font.Color := clBlack;
      PageDescriptionLabel.Transparent := True;
      PageDescriptionLabel.Parent := WizardForm.MainPanel;

  FinishedHeadingLabel:=TLabel.Create(WizardForm);
  FinishedHeadingLabel.Left := ScaleX(150);
  FinishedHeadingLabel.Top := ScaleY(15);
  FinishedHeadingLabel.Width := ScaleX(320);
  FinishedHeadingLabel.Height := ScaleY(75);
  FinishedHeadingLabel.AutoSize := False;
  FinishedHeadingLabel.WordWrap := True;
  FinishedHeadingLabel.Font.Color := clBlack;
// здесь тоже можно поиграть шрифтом
//  FinishedHeadingLabel.Font.Style := [fsBold];
//  FinishedHeadingLabel.Font.Name:='MS Sans Serif';
  FinishedHeadingLabel.Font.Size := 14;
  FinishedHeadingLabel.Transparent := True;
  FinishedHeadingLabel.Parent := WizardForm.FinishedPage;

      FinishedLabel:=TLabel.Create(WizardForm);
      FinishedLabel.Left := ScaleX(150);
      FinishedLabel.Top := ScaleY(90);
      FinishedLabel.Width := ScaleX(320);
      FinishedLabel.Height := ScaleY(200);
      FinishedLabel.AutoSize := False;
      FinishedLabel.WordWrap := True;
      FinishedLabel.Font.Color := clBlack;
      FinishedLabel.Font.Size := 8;
      FinishedLabel.Transparent := True;
      FinishedLabel.Parent := WizardForm.FinishedPage;

  RunMyProg := TCheckBox.Create(WizardForm);
  RunMyProg.Parent := WizardForm.FinishedPage;
  RunMyProg.Left := ScaleX(150);
  RunMyProg.Top := ScaleY(152);
  RunMyProg.Width := ScaleX(14);
  RunMyProg.Height := ScaleX(14);
//  RunMyProg.Checked := true; // чтоб чебокс был отмечен, раскоментируй строку

      RunLabel:=TLabel.Create(WizardForm);
      RunLabel.Left := ScaleX(170);
      RunLabel.Top := ScaleY(150);
      RunLabel.Width := ScaleX(200);
      RunLabel.Height := ScaleY(20);
      RunLabel.AutoSize := False;
      RunLabel.WordWrap := True;
      RunLabel.Font.Color := clBlack;
      RunLabel.Font.Size := 10;
      RunLabel.Transparent := True;
      RunLabel.Parent := WizardForm.FinishedPage;
end;

procedure CurPageChanged(CurPageID: Integer);
begin
  WelcomeLabel1.Caption := WizardForm.WelcomeLabel1.Caption;
  WelcomeLabel2.Caption := WizardForm.WelcomeLabel2.Caption;
  PageNameLabel.Caption := WizardForm.PageNameLabel.Caption;
  PageDescriptionLabel.Caption := WizardForm.PageDescriptionLabel.Caption;
  FinishedHeadingLabel.Caption := WizardForm.FinishedHeadingLabel.Caption;
  FinishedLabel.Caption := WizardForm.FinishedLabel.Caption;
// здесь придётся вручную вводить требуемый текст
  RunLabel.Caption := 'Запустить программу';
end;