AMD NPU EP download error——Error: VitisAIExecutionProvider is not available on this system.

Issue: AMD NPU EP Download Error
Background

My PC originally had the AMD NPU Execution Provider (EP) installed.
To verify the automatic EP download functionality, I manually deleted the following two folders under

C:\Program Files\WindowsApps:

Microsoft.WindowsMLRuntime.AMD.NPU.EP_0.1.9.0_x64__8wekyb3d8bbwe

MicrosoftCorporationII.WinML.AMD.NPU.EP.1.8_1.8.26.0_x64__8wekyb3d8bbwe

Then, I added the following test code in
C:\test\WindowsAppSDK\WindowsAppSDK-Samples-main\Samples\WindowsML\cpp\CppConsoleDesktop
to test whether the EP can be automatically redownloaded:

#include <winrt/Microsoft.Windows.AI.MachineLearning.h>
#include <winml/onnxruntime_cxx_api.h>
#include <winrt/Windows.Foundation.h>
#include <iostream>
#include <vector>

int main()
{
    try
    {
        winrt::init_apartment();

        Ort::Env env(ORT_LOGGING_LEVEL_WARNING, "CppDemo");
        std::cout << "ONNX Version string: " << Ort::GetVersionString() << std::endl;
        std::cout << "Getting available providers..." << std::endl;

        auto catalog = winrt::Microsoft::Windows::AI::MachineLearning::ExecutionProviderCatalog::GetDefault();
        catalog.EnsureAndRegisterCertifiedAsync().get();

        auto providers = catalog.FindAllProviders();
        std::cout << "Available providers from catalog:" << std::endl;
        for (auto const& provider : providers)
        {
            std::wcout << L"  Provider: " << provider.Name().c_str() << std::endl;
            provider.EnsureReadyAsync().get();
            provider.TryRegister();
        }

        std::vector<Ort::ConstEpDevice> ep_devices = env.GetEpDevices();
        std::cout << "All available EP devices:" << std::endl;
        for (const auto& d : ep_devices)
        {
            std::cout << "  EP Name: " << d.EpName() << ", Device ID: " << std::endl;
        }

        std::vector<Ort::ConstEpDevice> selected_ep_devices;
        for (const auto& d : ep_devices)
        {
            if (std::string(d.EpName()) == "VitisAIExecutionProvider")
            {
                selected_ep_devices.push_back(d);
                std::cout << "Found AMD NPU device: " << d.EpName() << std::endl;
            }
        }
        if (selected_ep_devices.empty())
        {
            throw std::runtime_error("VitisAIExecutionProvider is not available on this system.");
        }

        Ort::SessionOptions sessionOptions;
        sessionOptions.SetEpSelectionPolicy(OrtExecutionProviderDevicePolicy_MAX_EFFICIENCY);

        std::cout << "SessionOptions configured with AMD NPU EP." << std::endl;
    }
    catch (const std::exception& ex)
    {
        std::cerr << "Error: " << ex.what() << std::endl;
    }

    return 0;
}

However, when I run the program, I get the following output:

ONNX Version string: 1.23.1
Getting available providers...
Available providers from catalog:
Provider: VitisAIExecutionProvider
All available EP devices:
EP Name: CPUExecutionProvider, Device ID:
EP Name: DmlExecutionProvider, Device ID:
EP Name: DmlExecutionProvider, Device ID:
Error: VitisAIExecutionProvider is not available on this system.

In fact, the deleted EP directories were not re-downloaded, which means the following call did not work as expected:

auto catalog = winrt::Microsoft::Windows::AI::MachineLearning::ExecutionProviderCatalog::GetDefault();
catalog.EnsureAndRegisterCertifiedAsync().get();

To restore functionality, I copied my backup folders
(MicrosoftCorporationII.WinML.AMD.NPU.EP.1.8_1.8.26.0_x64__8wekyb3d8bbwe)
back into C:\Program Files\WindowsApps, but the same error still occurs.

Therefore, I would like to ask how I can make the EP re-download the correct AMD NPU Execution Provider files so that the NPU can work properly？
I suspect that my deletion method was incorrect, which caused the automatic re-download and detection mechanism to stop working. Is there any way to restore it to normal?

Start with the CppConsoleDesktop sample and the calls to ExecutionProviderCatalog::GetDefault, EnsureAndRegisterCertifiedAsync, FindAllProviders, and EnsureReadyAsync. Reproduce the missing VitisAIExecutionProvider after deleting the listed WindowsApps folders, then determine the documented recovery path; done means the certified provider is restored and appears in the EP device list.