Automatically downgrade from Roblox "beta" builds to the latest release version

beta_removal.cs

using System;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Net;
using Microsoft.Win32;

namespace beta_removal
{
    class Program
    {
        static void Main(string[] args)
        {
            using var wc = new WebClient();
            
            // first, get the location of the "Roblox" folder
            // usually at %localappdata%\Roblox but its best to make sure
            
            var robloxFolder = String.Join("\\", ((string)Registry.ClassesRoot.OpenSubKey("roblox-player\\shell\\open\\command", true).GetValue(null))
                .Split('\\').SkipLast(1)).Replace("\"", ""); // what a mess
            
            if (robloxFolder.Contains("Program Files") &&
                !(new WindowsPrincipal(WindowsIdentity.GetCurrent()).IsInRole(WindowsBuiltInRole.Administrator)))
            {
                Console.WriteLine("Your ROBLOX folder is located in \"C:\\Program Files (x86)\" which requires admin rights to access\nPlease restart the program as Administrator");
                Console.ReadKey();
                Environment.Exit(1);
            }

            var robloxExecutable = Path.Combine(robloxFolder, "RobloxPlayerBeta.exe");

            var currentHash = wc.DownloadString("https://pastebin.com/raw/9tnbrk3v");

            if (SHA512(robloxExecutable) == currentHash)
            {
                // not on a beta
                Console.WriteLine("You're not on a ROBLOX beta build.\nPress any key to exit");
                Console.ReadKey();
                Environment.Exit(1);
            }
            // uh oh
            Console.WriteLine("Incorrect ROBLOX version detected.");
            
            var currentVersion = wc.DownloadString("http://setup.roblox.com/version");
            
            Console.WriteLine("Downloading ROBLOX...");
            
            var zipBytes = wc.DownloadData($"http://setup.roblox.com/{currentVersion}-RobloxApp.zip");
            
            Console.WriteLine("Extracting ROBLOX...");

            var archive = new ZipArchive(new MemoryStream(zipBytes)); // why bother using temp? just do everything via memory 💪

            var robloxPlayerBeta = new MemoryStream();
            
            archive.GetEntry("RobloxPlayerBeta.exe")?.Open().CopyTo(robloxPlayerBeta); // probably not the most efficient but whatever

            if (robloxPlayerBeta.Length == 0) fuck();
            
            File.WriteAllBytes(robloxExecutable, robloxPlayerBeta.ToArray());

            // ensures success
            if (SHA512(robloxExecutable) == currentHash)
            {
                Console.WriteLine("Success!");
                Console.WriteLine(
                    "You're no longer on the ROBLOX beta.\nIf your ROBLOX updates again, feel free to re-run this utility.\nPress any key to exit");
                Console.ReadKey();
            }
            else fuck();
        }

        static void fuck()
        {
            Console.WriteLine("Something went wrong, Please reinstall ROBLOX.");
            Console.ReadKey();
            Environment.Exit(1);
        }
        
        static string SHA512(string path)
        {
            var bytes = File.ReadAllBytes(path);
            using (var hash = System.Security.Cryptography.SHA512.Create())
            {
                var hashedInputBytes = hash.ComputeHash(bytes);
                var hashedInputStringBuilder = new System.Text.StringBuilder(128);
                foreach (var b in hashedInputBytes)
                    hashedInputStringBuilder.Append(b.ToString("X2"));
                return hashedInputStringBuilder.ToString();
            }
        }
    }
}