Install Winget without Powershell

Program.cs

using System.Collections;
using System.Net;
using System.IO.Compression;
using Windows.Management.Deployment;

namespace MSIXInstaller
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("MSIX Installer");

            try
            {
                // Download and install the Microsoft.VCLibs.x64.14.00.Desktop.appx package
                Console.WriteLine("Downloading Microsoft.VCLibs.x64.14.00.Desktop.appx...");
                DownloadFile("https://aka.ms/Microsoft.VCLibs.x64.14.00.Desktop.appx", "Microsoft.VCLibs.x64.14.00.Desktop.appx");
                InstallAppxPackage("Microsoft.VCLibs.x64.14.00.Desktop.appx");

                // Step 2: Download and extract Microsoft.UI.Xaml package
                string xamlPackageUrl = "https://www.nuget.org/api/v2/package/Microsoft.UI.Xaml/2.7.3";
                string xamlZipFilePath = "./microsoft.ui.xaml.2.7.3.zip";
                string extractedFolderPath = "./microsoft.ui.xaml.2.7.3";

                Console.WriteLine($"Downloading {xamlPackageUrl}...");
                DownloadFile(xamlPackageUrl, xamlZipFilePath);

                Console.WriteLine("Extracting the package...");
                ExtractZipFile(xamlZipFilePath, extractedFolderPath);

                // Step 3: Install Microsoft.UI.Xaml.appx
                string appxFilePath = Path.Combine(extractedFolderPath, "tools", "AppX", "x64", "Release", "Microsoft.UI.Xaml.2.7.appx");
                Console.WriteLine("Installing Microsoft.UI.Xaml.appx...");
                InstallAppxPackage(appxFilePath);

                // Step 4: Download and install the Winget MSIX bundle
                string wingetPackageUrl = "https://github.com/microsoft/winget-cli/releases/latest/download/Microsoft.DesktopAppInstaller_8wekyb3d8bbwe.msixbundle";
                string wingetMsixBundleFilePath = "./Microsoft.DesktopAppInstaller_8wekyb3d8bbwe.msixbundle";

                Console.WriteLine($"Downloading {wingetPackageUrl}...");
                DownloadFile(wingetPackageUrl, wingetMsixBundleFilePath);

                Console.WriteLine("Installing Microsoft.DesktopAppInstaller_8wekyb3d8bbwe.msixbundle...");
                InstallAppxPackage(wingetMsixBundleFilePath);

                Console.WriteLine("Installation completed successfully.");
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error occurred during installation:");
                Console.WriteLine(ex);
                //Join ex.Data key value pairs to string
                if (ex.Data.Count > 0)
                {
                    Console.WriteLine("  Extra details:");
                    foreach (DictionaryEntry de in ex.Data)
                        Console.WriteLine("    Key: {0,-20}      Value: {1}",
                            "'" + de.Key + "'", de.Value);
                }
                //Join ex.Data key value pairs to string
                if (ex.InnerException?.Data.Count > 0)
                {
                    Console.WriteLine("  Extra details:");
                    foreach (DictionaryEntry de in ex.InnerException.Data)
                        Console.WriteLine("    Key: {0,-20}      Value: {1}",
                            "'" + de.Key + "'", de.Value);
                }
            }
            Console.ReadLine();
        }

        static void DownloadFile(string url, string filePath)
        {
            using (WebClient webClient = new WebClient())
            {
                webClient.DownloadFile(url, filePath);
            }
        }

        static void ExtractZipFile(string zipFilePath, string extractPath)
        {
            ZipFile.ExtractToDirectory(zipFilePath, extractPath);
        }

        static void InstallAppxPackage(string packagePath)
        {
            PackageManager packageManager = new PackageManager();
            var deploymentResult = packageManager.AddPackageAsync(new Uri(Path.GetFullPath(packagePath)), null, DeploymentOptions.None).AsTask().Result;
            if (deploymentResult.IsRegistered)
            {
                Console.WriteLine("Package installed successfully.");
            }
            else
            {
                Console.WriteLine("Failed to install the package.");
            }
        }
    }
}

project.csproj

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>net7.0-windows10.0.19041.0</TargetFramework>
        <ImplicitUsings>enable</ImplicitUsings>
        <Nullable>enable</Nullable>
    </PropertyGroup>
</Project>