Inno Setup - Problem z kompilacją

; Script generated by the Inno Setup Script Wizard.
; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!

#define MyAppName "Half-Life 2"
#define MyAppPublisher "Valve Corporation"
#define MyAppURL "http://www.half-life2.com/";

[Setup]
; NOTE: The value of AppId uniquely identifies this application.
; Do not use the same AppId value in installers for other applications.
; (To generate a new GUID, click Tools | Generate GUID inside the IDE.)
AppId={{34AAED79-2EC8-4EAD-A7B5-97DDA9A44689}
AppName={#MyAppName}
AppVerName={#MyAppName}
AppPublisher={#MyAppPublisher}
AppPublisherURL={#MyAppURL}
AppSupportURL={#MyAppURL}
AppUpdatesURL={#MyAppURL}
DefaultDirName={reg:HKLM\Software\Valve\Steam,InstallPath}\steamapps
DisableDirPage=true
DefaultGroupName={#MyAppName}
DisableProgramGroupPage=false
OutputDir=E:\Hubertusix\IlstallHL2
OutputBaseFilename=setup
SetupIconFile=D:\Hubert\game.ico
InfoBeforeFile=D:\Hubert\BeforeInstall.txt
Compression=lzma
SolidCompression=true
Uninstallable=false
WizardImageFile=D:\Hubert\hl2.bmp
WizardSmallImageFile=D:\Hubert\hl22.bmp

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

[Files]
Source: E:\Hubertusix\steamapps\osztenkurden\*; DestDir: {app}; Flags: ignoreversion recursesubdirs createallsubdirs; BeforeInstall: MyBeforeInstall
Source: E:\Hubertusix\steamapps\half-life 2 2007 base content.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\half-life 2 content.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\half-life 2 game dialog.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\source 2007 binaries 2.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\source 2007 shared materials.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\source 2007 shared models.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\source 2007 shared sounds.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\source engine.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\source materials.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\source models.gcf; DestDir: {app}; Flags: ignoreversion
Source: E:\Hubertusix\steamapps\source sounds.gcf; DestDir: {app}; Flags: ignoreversion
; NOTE: Don't use "Flags: ignoreversion" on any shared system files

[Code]
var CancelWithoutPrompt: boolean;

function InitializeSetup(): Boolean;
begin
  CancelWithoutPrompt := false;
  result := true;
end;

procedure MyBeforeInstall();
begin
  if FileExists(ExpandConstant('{reg:HKLM\Software\Valve\Steam,InstallPath}\steamapps\half-life 2 content.gcf')) then begin
        MsgBox('Masz już zainstalowaną grę Half-Life 2. Okno instalatora zamknie się samoczynnie.', mbError, MB_OK);
        CancelWithoutPrompt := true;
        WizardForm.Close;
  end;
end;

procedure CancelButtonClick(CurPageID: Integer; var Cancel, Confirm: Boolean);
begin
  if CurPageID=wpInstalling then
    Confirm := not CancelWithoutPrompt;
end;