VersionList.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using System.Net.Http;
using System.Runtime.Serialization.Json;
using System.Xml;
using System;
using System.Xml.Linq;
using Windows.Data.Json;
using System.Web.Script.Serialization;
using System.IO;

static class Program
{
    static readonly HttpClient Client = new();

    const string Packages = "https://raw.githubusercontent.com/ddf8196/mc-w10-versiondb-auto-update/master/versions.json.min";

    const string Supported = "https://raw.githubusercontent.com/flarialmc/newcdn/main/launcher/NewSupported.txt";

    static async Task<HashSet<string>> SupportedAsync()
    {
        HashSet<string> collection = [];
        using StreamReader reader = new(await Client.GetStreamAsync(Supported));
        string value; while ((value = await reader.ReadLineAsync()) != default) collection.Add(value);
        return collection;
    }

    static async Task<Dictionary<string, string>> PackagesAsync() => await Task.Run(async () =>
    {
        var @this = await SupportedAsync();
        Dictionary<string, string> @params = [];

        foreach (var item in JsonArray.Parse(await Client.GetStringAsync(Packages)))
        {
            var value = item.GetArray(); if (value.GetNumberAt(2) != default) continue;
            var key = value.GetStringAt(default);

            if ([email protected](key = key.Substring(default, key.LastIndexOf('.')))) continue;
            @params.Add(key, value.GetStringAt(1));
        }

        return @params;
    });

    static async Task Main() => Console.WriteLine(new JavaScriptSerializer
    {
        MaxJsonLength = int.MaxValue,
        RecursionLimit = int.MaxValue
    }.Serialize(await PackagesAsync()));
}