versionmanager + some more

.gitignore

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+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.sln.docstates
+ .idea/
+
+# Build results
+
+[Dd]ebug/
+[Rr]elease/
+x64/
+[Bb]in/
+[Oo]bj/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.log
+*.svclog
+*.scc
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opensdf
+*.sdf
+*.cachefile
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.Publish.xml
+*.pubxml
+*.azurePubxml
+
+# NuGet Packages Directory
+## TODO: If you have NuGet Package Restore enabled, uncomment the next line
+packages/
+## TODO: If the tool you use requires repositories.config, also uncomment the next line
+!packages/repositories.config
+
+# Windows Azure Build Output
+csx/
+*.build.csdef
+
+# Windows Store app package directory
+AppPackages/
+
+# Others
+sql/
+*.Cache
+ClientBin/
+[Ss]tyle[Cc]op.*
+![Ss]tyle[Cc]op.targets
+~$*
+*~
+*.dbmdl
+*.[Pp]ublish.xml
+
+*.publishsettings
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file to a newer
+# Visual Studio version. Backup files are not needed, because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+App_Data/*.mdf
+App_Data/*.ldf
+
+# =========================
+# Windows detritus
+# =========================
+
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Mac desktop service store files
+.DS_Store
+
+_NCrunch*

README.md

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+# Roblox Legacy Patcher
+## What is this?
+This is a C# application which automatically downloads the latest version of Roblox Studio and makes it work on Windows 8.1 and below. It can run natively on Windows 8 and 8.1 with a patch, but a wrapper is also used if you're on Windows 7 due to missing DX apis.
+
+## Notice
+Currently, the application only allows you to run Roblox Studio. Because of Roblox's anticheat (aka Hyperion), we have not been able to get the client to work as of right now.

RobloxLegacy.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RobloxLegacy", "RobloxLegacy\RobloxLegacy.csproj", "{B3AE869E-4EC7-424E-AF85-AAC61974D3A2}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B3AE869E-4EC7-424E-AF85-AAC61974D3A2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B3AE869E-4EC7-424E-AF85-AAC61974D3A2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B3AE869E-4EC7-424E-AF85-AAC61974D3A2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B3AE869E-4EC7-424E-AF85-AAC61974D3A2}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

RobloxLegacy/AppData/IAppData.cs

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+namespace RobloxLegacy.AppData;
+
+public interface IAppData
+{
+    string Name { get; }
+    Dictionary<string, string> PackageFiles { get; }
+}

RobloxLegacy/AppData/StudioData.cs

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+namespace RobloxLegacy.AppData;
+
+public class StudioData : IAppData
+{
+    public string Name => "WindowsStudio64";
+    public Dictionary<string, string> PackageFiles { get; } = new()
+    {
+        ["RobloxStudio.zip"]                    = "",
+        ["RibbonConfig.zip"]                    = "RibbonConfig/",
+        ["redist.zip"]                          = "",
+        ["Libraries.zip"]                       = "",
+        ["LibrariesQt5.zip"]                    = "",
+        ["WebView2.zip"]                        = "",
+        ["WebView2RuntimeInstaller.zip"]        = "",
+
+        ["shaders.zip"]                         = "shaders/",
+        ["ssl.zip"]                             = "ssl/",
+        ["Qml.zip"]                             = "Qml/",
+        ["Plugins.zip"]                         = "Plugins/",
+        ["StudioFonts.zip"]                     = "StudioFonts/",
+        ["BuiltInPlugins.zip"]                  = "BuiltInPlugins/",
+        ["ApplicationConfig.zip"]               = "ApplicationConfig/",
+        ["BuiltInStandalonePlugins.zip"]        = "BuiltInStandalonePlugins/",
+
+        ["content-qt_translations.zip"]         = "content/qt_translations/",
+        ["content-sky.zip"]                     = "content/sky/",
+        ["content-fonts.zip"]                   = "content/fonts/",
+        ["content-avatar.zip"]                  = "content/avatar/",
+        ["content-models.zip"]                  = "content/models/",
+        ["content-sounds.zip"]                  = "content/sounds/",
+        ["content-configs.zip"]                 = "content/configs/",
+        ["content-api-docs.zip"]                = "content/api_docs/",
+        ["content-textures2.zip"]               = "content/textures/",
+        ["content-studio_svg_textures.zip"]     = "content/studio_svg_textures/",
+
+        ["content-platform-fonts.zip"]          = "PlatformContent/pc/fonts/",
+        ["content-platform-dictionaries.zip"]   = "PlatformContent/pc/shared_compression_dictionaries/",
+        ["content-terrain.zip"]                 = "PlatformContent/pc/terrain/",
+        ["content-textures3.zip"]               = "PlatformContent/pc/textures/",
+
+        ["extracontent-translations.zip"]       = "ExtraContent/translations/",
+        ["extracontent-luapackages.zip"]        = "ExtraContent/LuaPackages/",
+        ["extracontent-textures.zip"]           = "ExtraContent/textures/",
+        ["extracontent-scripts.zip"]            = "ExtraContent/scripts/",
+        ["extracontent-models.zip"]             = "ExtraContent/models/"
+    };
+}

RobloxLegacy/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+Console.WriteLine("hi");

RobloxLegacy/RobloxLegacy.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="6.0.0" />
+    </ItemGroup>
+
+</Project>

RobloxLegacy/Utilities/Logger.cs

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+namespace RobloxLegacy.Utilities;
+
+public static class Logger
+{
+    public static void Log(string msg)
+    {
+        Console.Write($"[+] {msg}");
+    }
+}

RobloxLegacy/VersionManager.cs

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+using System.Text.Json.Serialization;
+using System.IO.Compression;
+using RobloxLegacy.AppData;
+using RobloxLegacy.Utilities;
+
+namespace RobloxLegacy;
+
+public abstract class VersionData
+{
+    [JsonPropertyName("version")]
+    public required string Version { get; set; }
+
+    [JsonPropertyName("clientVersionUpload")]
+    public required string UploadHash { get; set; }
+}
+
+public class VersionManager(IAppData appData)
+{
+    private static readonly HttpClient Client = new();
+    private const string CdnUrl = "https://setup.rbxcdn.com";
+
+    private static string GetVersionPath(string version)
+    {
+        var localAppDataPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        return Path.Combine(localAppDataPath, "Roblox", "Versions", version);
+    }
+    
+    private async Task<VersionData?> GetLatestVersion()
+    {
+        var url = $"https://clientsettings.roblox.com/v2/client-version/{appData.Name}/channel/LIVE";
+        var response = await Client.GetAsync(url);
+        if(!response.IsSuccessStatusCode) // just to be safe
+            return null;
+        var version = await response.Content.ReadAsAsync<VersionData>();
+        return version;
+    }
+
+    private static void ExtractBundle(string version, string folder, Stream file)
+    {
+        var extractPath = Path.Combine(GetVersionPath(version), folder);
+        ZipFile.ExtractToDirectory(file, extractPath);
+    }
+
+    public async Task InstallPackage()
+    {
+        var version = await GetLatestVersion();
+        if(version == null)
+            throw new Exception("No version data found");
+        
+        Logger.Log($"Installing {appData.Name} version {version.Version}");
+        foreach (var file in appData.PackageFiles)
+        {
+            var fileName = $"{version.UploadHash}-{file.Key}";
+            var fileStream = await Client.GetStreamAsync($"{CdnUrl}/{fileName}");
+            ExtractBundle(version.UploadHash, file.Value, fileStream);
+        }
+    }
+}