I am designing a WIX 3.6 installer project, during the installation we need to grand the user create file permission to the install folder(INSTALLDIR, especially with the default install folder, the Program Files, the user normally can't create file in the installation. We've experienced some failures). I guess it can be achieved by setting a Permission element, with CreateFile property. However, the INSTALLDIR is a directory, and only such elements as CreateFolder, File, FileShare, Registry, ServiceInstall can have permission element. So could anyone tell me how to do that? My directory declaration is something like this:

<Directory Id="TARGETDIR" Name="SourceDir">
    <Directory Id="ProgramFiles64Folder">
      <Directory Id='MANUFACTUREFOLDER' Name='$(var.ManufacturerName)'>
        <Directory Id="INSTALLDIR" Name="$(var.ProductName)">

Thanks!