HRESULT XPackageRegisterPackageInstalled(  
         XTaskQueueHandle queue,  
         void* context,  
         XPackageInstalledCallback* callback,  
         XTaskQueueRegistrationToken* token  
)  

void CALLBACK NewPackageAdded(void* /* context */, const XPackageDetails* details)
{
    if (details->kind == XPackageKind::Content)
    {
        printf("Package added: %s\n", details->displayName);
    }
}

HRESULT ListenForNewDlc(XTaskQueueHandle queue, XTaskQueueRegistrationToken* token)
{
    HRESULT hr = XPackageRegisterPackageInstalled(queue, nullptr, NewPackageAdded, token);
    return hr;
}

void StopListeningForDlc(XTaskQueueRegistrationToken token)
{
    XPackageUnregisterPackageInstalled(token, false);
}