Изменить каталог установки WIX Bootstrapper

У меня возникли проблемы с заменой каталога установки моего проекта WIX в пользовательском проекте загрузчика. Решение состоит из 3 проектов (Custom Bootstrapper, Installer Project и BootstrapperSetup).

product.wcs в проекте установщика выглядит так:

<?xml version="1.0" encoding="UTF-8"?>
<?include $(sys.CURRENTDIR)\Settings\settings.wxi ?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
     xmlns:bal="http://schemas.microsoft.com/wix/BalExtension">

<Product Id="*" Name="$(var.ProductName)" Language="1033" Version="1.0.0.0" Manufacturer="$(var.Manufacturer)" UpgradeCode="f4c5c824-17e9-4897-9af0-49b2b1225251">
<Package InstallerVersion="300" Compressed="yes" InstallScope="perMachine" />

<MajorUpgrade DowngradeErrorMessage="A newer version of $(var.ProductName) is already installed." />
<MediaTemplate />

<Property Id="PRODUCTNAME" Value="$(var.ProductName)" />
<Property Id="INSTALL_LOCATION" Value="ApplicationInstallDir"/>

<Directory Id="TARGETDIR" Name="SourceDir">
  <Directory Id="$(var.PlatformProgramFilesFolder)" Name="PFiles">
    <Directory Id="DirManufacturer" Name="$(var.Manufacturer)">
      <Directory Id="ApplicationInstallDir" Name="$(var.ProductName)">
        <Component Id="ProductComponent" KeyPath="yes" Guid="28982BC3-BCEA-4EAF-9E7E-9E19A9355CFA">
          <File Id="Norma12" Name="$(var.Norma 12.TargetFileName)" Source="$(var.Norma 12.TargetPath)" DiskId="1" />
          <CreateFolder />
        </Component>
      </Directory>
    </Directory>
  </Directory>
</Directory>

<Feature Id="ProductFeature" Title="InstallerProject" Level="1">
  <ComponentRef Id="ProductComponent" />
</Feature>

</Product>
</Wix>

Пакет bundle.wxs выглядит так:

<?xml version="1.0" encoding="UTF-8"?>
<?include $(sys.CURRENTDIR)\Settings\settings.wxi ?> 

<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi" 
 xmlns:util="http://schemas.microsoft.com/wix/UtilExtension"
 xmlns:bal="http://schemas.microsoft.com/wix/BalExtension">

<Bundle Name="$(var.ApplicationName)" Version="$(var.Version)" Manufacturer="$(var.Manufacturer)" 
      UpgradeCode="ba657b0d-46d6-452a-aa4c-4212dda03d52"
      Copyright="Copyright (c) 2013 $(var.Manufacturer). All rights reserved."
      HelpUrl="http://www.miconsultancy.com" AboutUrl="http://www.miconsultancy.com">

<BootstrapperApplicationRef Id="ManagedBootstrapperApplicationHost">
  <Payload SourceFile="$(var.MI Wix.TargetDir)\BootstrapperCore.config"/>
  <Payload SourceFile="$(var.MI Wix.TargetPath)"/>
  <Payload SourceFile="C:\Program Files (x86)\WiX Toolset v3.7\SDK\Microsoft.Deployment.WindowsInstaller.dll"/>
</BootstrapperApplicationRef>

<Variable Name="ProjectName" Type="string" Value="$(var.ApplicationName)"  />
<Variable Name="LicenseRTF" Type="string" Value="$(var.MI Wix.ProjectDir)\License\mi_lic.rtf"/>
<Variable Name="ProductID" Type="string" Value="$(var.ApplicationID)"/>
<Variable Name="varInstallLocation" Type="string" Value="\$(var.Manufacturer)\$(var.ApplicationName)"/>

<Chain>
  <!-- TODO: Define the list of chained packages. -->
  <PackageGroupRef Id='Netfx4Full' />

  <MsiPackage Compressed="yes"
              SourceFile="$(var.InstallerProject.TargetPath)"
              Vital="yes" Id="$(var.ApplicationID)" >
    <MsiProperty Name="INSTALL_LOCATION" Value="[varInstallLocation]"/>
  </MsiPackage>
    </Chain>
</Bundle>

<Fragment>
<!-- Managed bootstrapper requires .NET as a dependency, since it was written in .NET.
   WiX provides a Bootstrapper for the bootstrapper. The fragment below includes .NET.
   For more information or examples see Heath Stewart's blog or the WiX source:
   http://blogs.msdn.com/b/heaths/archive/2011/10/28/introducing-managed-bootstrapper-applications.aspx
   -->

<WixVariable Id="WixMbaPrereqPackageId" Value="Netfx4Full" />
<WixVariable Id="WixMbaPrereqLicenseUrl" Value="NetfxLicense.rtf" />

<util:RegistrySearch Root="HKLM" Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Full" Value="Version" Variable="Netfx4FullVersion" />
<util:RegistrySearch Root="HKLM" Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Full" Value="Version" Variable="Netfx4x64FullVersion" Win64="yes" />

<PackageGroup Id="Netfx4Full">
  <ExePackage Id="Netfx4Full" Cache="no" Compressed="yes" PerMachine="yes" Permanent="yes" Vital="yes"
              SourceFile="C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bootstrapper\Packages\DotNetFX40\dotNetFx40_Full_x86_x64.exe"
              DownloadUrl="http://go.microsoft.com/fwlink/?LinkId=164193"
              DetectCondition="Netfx4FullVersion AND (NOT VersionNT64 OR Netfx4x64FullVersion)" />
</PackageGroup>
</Fragment>
</Wix>

Переменная varInstallLocation должна быть изменена в пользовательском загрузчике, это делается с помощью:

BootstrapperApplication.Engine.StringVariables("varInstallLocation") = s_installDirectory

Но когда я сохраняю код, новый путь установки не сохраняется в переменной, и приложение будет установлено в местоположении по умолчанию. Может ли кто-нибудь помочь мне здесь, пожалуйста.