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на время установки файлов кнопку "отмена" сделать неактивной »

Замените в скрипте procedure CurPageChanged, на эту:

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Код:

procedure CurPageChanged(CurPageID: Integer);
var
  ResultCode: Integer;
  UnInstallPath: string;
begin
  PageID:= CurPageID;
  PageNameLabel.Caption:= WizardForm.PageNameLabel.Caption;
  PageDescriptionLabel.Caption:= WizardForm.PageDescriptionLabel.Caption;
  PageNameLabel1.Caption:= 'Апаратное Обеспечение';
  PageDescriptionLabel1.Caption:= 'Программа установки обнаружила следуюшие необходимые компоненты';
  PageNameLabel2.Caption:= WizardForm.PageNameLabel.Caption;
  PageDescriptionLabel2.Caption:= WizardForm.PageDescriptionLabel.Caption;
  PageNameLabel3.Caption:= WizardForm.PageNameLabel.Caption;
  PageDescriptionLabel3.Caption:= WizardForm.PageDescriptionLabel.Caption;
  PageNameLabel4.Caption:= WizardForm.PageNameLabel.Caption;
  PageDescriptionLabel4.Caption:= WizardForm.PageDescriptionLabel.Caption;
  PageNameLabel5.Caption:= WizardForm.PageNameLabel.Caption;
  PageDescriptionLabel5.Caption:= WizardForm.PageDescriptionLabel.Caption;
  PageNameLabel6.Caption:= WizardForm.PageNameLabel.Caption;
  PageDescriptionLabel6.Caption:= WizardForm.PageDescriptionLabel.Caption;
  PageNameLabel7.Caption:= WizardForm.PageNameLabel.Caption;
  PageDescriptionLabel7.Caption:= WizardForm.PageDescriptionLabel.Caption;
  PageNameLabel8.Caption:= WizardForm.PageNameLabel.Caption;
  PageDescriptionLabel8.Caption:= WizardForm.PageDescriptionLabel.Caption;
  if CurPageID = wpSelectDir then
    begin
      GetNeedSpaceCaption;
      if FreeMB < NeedSize then
      WizardForm.NextButton.Enabled:= False;
    end;
  if CurPageID = wpReady then
    begin
      WizardForm.BackButton.Enabled:= False;
      RegQueryStringValue(HKLM, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{C05D8CDB-417D-4335-A38C-A0659EDFD6B8}_is1','UninstallString', UnInstallPath);
      UnInstallPath:= RemoveQuotes(UnInstallPath);
      Exec(UnInstallPath, '/VERYSILENT','', SW_HIDE, ewWaitUntilTerminated, ResultCode);
    end;
  if CurPageID = wpInstalling then
      WizardForm.CancelButton.Enabled:= False;
  if CurPageID = wpFinished then
    WizardForm.Position:= poScreenCenter;
end;