C# neden hata veriyor?

using CmlLib.Core.Auth;
using CmlLib.Core;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using CmlLib.Core.Version;
using Guna.UI2.WinForms;


namespace Anteer_Client_V2
{
    public partial class Main : Form
    {
        [Obsolete]
        public Main()
        {
            InitializeComponent();
        }

        [Obsolete]
        public Main(MSession session)
        {
            this.session = session;
            InitializeComponent();
        }

        CMLauncher launcher;
        readonly MSession session;

        private async void Main_Load(object sender, EventArgs e)
        {
            await path(); // path artık async oldu
            var request = WebRequest.Create("https://minotar.net/helm/" + session.Username + "/100.png");
            using (var response = request.GetResponse())
            using (var stream = response.GetResponseStream())
            {
                guna2CirclePictureBox1.Image = Bitmap.FromStream(stream);
            }
        }

        private void guna2Panel1_Paint(object sender, PaintEventArgs e)
        {

        }

        private async Task initializeLauncher(MinecraftPath path)
        {
            lbUsername.Text = session.Username;
            launcher = new CMLauncher(path);
            await Task.CompletedTask;
        }

        private async void Main_Shown(object sender, EventArgs e)
        {
            var defaultPath = new MinecraftPath(MinecraftPath.GetOSDefaultPath());
            await initializeLauncher(defaultPath);
        }

        private async Task path()
        {
            MinecraftPath path = new MinecraftPath();
            launcher = new CMLauncher(path);
            var versions = await launcher.GetAllVersionsAsync();
            versionBox.Items.Clear();
            foreach (var item in versions)
            {
                if (item.MType != MVersionType.Snapshot && item.MType != MVersionType.OldAlpha && item.MType != MVersionType.OldBeta)
                {
                    versionBox.Items.Add(item.Name);
                }
            }

            if (versionBox.Items.Count > 0)
                versionBox.SelectedIndex = 0;
        }

        [Obsolete]
        private void logoutBtn_Click(object sender, EventArgs e)
        {
            var f = new Login();
            f.Show();
            Hide();
        }

        private async void showSnapshots_CheckedChanged(object sender, EventArgs e)
        {
            versionBox.Items.Clear();
            var versions = await launcher.GetAllVersionsAsync();

            foreach (var item in versions)
            {
                if (showSnapshots.Checked || (
                    item.MType != MVersionType.Snapshot &&
                    item.MType != MVersionType.OldAlpha &&
                    item.MType != MVersionType.OldBeta))
                {
                    versionBox.Items.Add(item.Name);
                }
            }

            if (versionBox.Items.Count > 0)
                versionBox.SelectedIndex = 0;
        }
    }
}

var versions = await launcher.GetAllVersionsAsync();

var versions = await launcher.VersionLoader.GetAllVersionsAsync();