bool XPackageIsPackagedProcess(  
)  

HRESULT IsPackageCompletelyInstalled(bool *isInstalled)
{
    if (XPackageIsPackagedProcess())
    {
        char id[XPACKAGE_IDENTIFIER_MAX_LENGTH];
        HRESULT hr = XPackageGetCurrentProcessPackageIdentifier(_countof(id), id);
        if (FAILED(hr)) return hr;

        XPackageInstallationMonitorHandle monitor;
        hr = XPackageCreateInstallationMonitor(id, 0, nullptr, 0, nullptr, &monitor);
        if (FAILED(hr)) return hr;

        XPackageInstallationProgress progress;
        XPackageGetInstallationProgress(monitor, &progress);

        *isInstalled = (progress.completed);

        XPackageCloseInstallationMonitorHandle(monitor);
    }
    else
    {
        *isInstalled = true;
    }

    return S_OK;
}