diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02cb7328..b92e31f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning 2.0](https://semver.org/spec/v2
 - Fixed failing InvokeAI install on macOS due to missing nodejs
 - Increased timeout on Recommended Models call to prevent potential timeout errors on slow connections
 - Fixed SynchronizationLockException when saving settings
+- Fixed missing tkinter dependency for OneTrainer on Windows
 
 ## v2.8.0
 ### Added
diff --git a/StabilityMatrix.Avalonia/Helpers/UnixPrerequisiteHelper.cs b/StabilityMatrix.Avalonia/Helpers/UnixPrerequisiteHelper.cs
index 26671b2b..296b1202 100644
--- a/StabilityMatrix.Avalonia/Helpers/UnixPrerequisiteHelper.cs
+++ b/StabilityMatrix.Avalonia/Helpers/UnixPrerequisiteHelper.cs
@@ -23,14 +23,14 @@ namespace StabilityMatrix.Avalonia.Helpers;
 
 [SupportedOSPlatform("macos")]
 [SupportedOSPlatform("linux")]
-public class UnixPrerequisiteHelper : IPrerequisiteHelper
+public class UnixPrerequisiteHelper(
+    IDownloadService downloadService,
+    ISettingsManager settingsManager,
+    IPyRunner pyRunner
+) : IPrerequisiteHelper
 {
     private static readonly Logger Logger = LogManager.GetCurrentClassLogger();
 
-    private readonly IDownloadService downloadService;
-    private readonly ISettingsManager settingsManager;
-    private readonly IPyRunner pyRunner;
-
     private DirectoryPath HomeDir => settingsManager.LibraryDir;
     private DirectoryPath AssetsDir => HomeDir.JoinDir("Assets");
 
@@ -46,17 +46,6 @@ public class UnixPrerequisiteHelper : IPrerequisiteHelper
     // Cached store of whether or not git is installed
     private bool? isGitInstalled;
 
-    public UnixPrerequisiteHelper(
-        IDownloadService downloadService,
-        ISettingsManager settingsManager,
-        IPyRunner pyRunner
-    )
-    {
-        this.downloadService = downloadService;
-        this.settingsManager = settingsManager;
-        this.pyRunner = pyRunner;
-    }
-
     private async Task<bool> CheckIsGitInstalled()
     {
         var result = await ProcessRunner.RunBashCommand("git --version");
diff --git a/StabilityMatrix.Avalonia/Helpers/WindowsPrerequisiteHelper.cs b/StabilityMatrix.Avalonia/Helpers/WindowsPrerequisiteHelper.cs
index c3cc382f..591302bc 100644
--- a/StabilityMatrix.Avalonia/Helpers/WindowsPrerequisiteHelper.cs
+++ b/StabilityMatrix.Avalonia/Helpers/WindowsPrerequisiteHelper.cs
@@ -20,14 +20,16 @@ using StabilityMatrix.Core.Services;
 namespace StabilityMatrix.Avalonia.Helpers;
 
 [SupportedOSPlatform("windows")]
-public class WindowsPrerequisiteHelper : IPrerequisiteHelper
+public class WindowsPrerequisiteHelper(
+    IGitHubClient gitHubClient,
+    IDownloadService downloadService,
+    ISettingsManager settingsManager,
+    IPyRunner pyRunner
+) : IPrerequisiteHelper
 {
     private static readonly Logger Logger = LogManager.GetCurrentClassLogger();
 
-    private readonly IGitHubClient gitHubClient;
-    private readonly IDownloadService downloadService;
-    private readonly ISettingsManager settingsManager;
-    private readonly IPyRunner pyRunner;
+    private readonly IGitHubClient gitHubClient = gitHubClient;
 
     private const string VcRedistDownloadUrl = "https://aka.ms/vs/16/release/vc_redist.x64.exe";
     private const string TkinterDownloadUrl =
@@ -62,19 +64,6 @@ public class WindowsPrerequisiteHelper : IPrerequisiteHelper
     public string GitBinPath => Path.Combine(PortableGitInstallDir, "bin");
     public bool IsPythonInstalled => File.Exists(PythonDllPath);
 
-    public WindowsPrerequisiteHelper(
-        IGitHubClient gitHubClient,
-        IDownloadService downloadService,
-        ISettingsManager settingsManager,
-        IPyRunner pyRunner
-    )
-    {
-        this.gitHubClient = gitHubClient;
-        this.downloadService = downloadService;
-        this.settingsManager = settingsManager;
-        this.pyRunner = pyRunner;
-    }
-
     public async Task RunGit(
         ProcessArgs args,
         Action<ProcessOutput>? onProcessOutput,
@@ -166,6 +155,11 @@ public class WindowsPrerequisiteHelper : IPrerequisiteHelper
         {
             await InstallNodeIfNecessary(progress);
         }
+
+        if (prerequisites.Contains(PackagePrerequisite.Tkinter))
+        {
+            await InstallTkinterIfNecessary(progress);
+        }
     }
 
     public async Task InstallAllIfNecessary(IProgress<ProgressReport>? progress = null)
diff --git a/StabilityMatrix.Core/Models/PackagePrerequisite.cs b/StabilityMatrix.Core/Models/PackagePrerequisite.cs
index 4d344173..c00a53fc 100644
--- a/StabilityMatrix.Core/Models/PackagePrerequisite.cs
+++ b/StabilityMatrix.Core/Models/PackagePrerequisite.cs
@@ -7,5 +7,6 @@ public enum PackagePrerequisite
     Git,
     Node,
     Dotnet7,
-    Dotnet8
+    Dotnet8,
+    Tkinter,
 }
diff --git a/StabilityMatrix.Core/Models/Packages/KohyaSs.cs b/StabilityMatrix.Core/Models/Packages/KohyaSs.cs
index c38c0e1f..c9cdf041 100644
--- a/StabilityMatrix.Core/Models/Packages/KohyaSs.cs
+++ b/StabilityMatrix.Core/Models/Packages/KohyaSs.cs
@@ -50,6 +50,8 @@ public class KohyaSs(
     public override IEnumerable<TorchVersion> AvailableTorchVersions => [TorchVersion.Cuda];
     public override IEnumerable<SharedFolderMethod> AvailableSharedFolderMethods =>
         new[] { SharedFolderMethod.None };
+    public override IEnumerable<PackagePrerequisite> Prerequisites =>
+        base.Prerequisites.Concat([PackagePrerequisite.Tkinter]);
 
     public override List<LaunchOptionDefinition> LaunchOptions =>
         [
@@ -114,12 +116,6 @@ public class KohyaSs(
         Action<ProcessOutput>? onConsoleOutput = null
     )
     {
-        if (Compat.IsWindows)
-        {
-            progress?.Report(new ProgressReport(-1f, "Installing prerequisites...", isIndeterminate: true));
-            await PrerequisiteHelper.InstallTkinterIfNecessary(progress).ConfigureAwait(false);
-        }
-
         progress?.Report(new ProgressReport(-1f, "Setting up venv", isIndeterminate: true));
         // Setup venv
         await using var venvRunner = new PyVenvRunner(Path.Combine(installLocation, "venv"));
diff --git a/StabilityMatrix.Core/Models/Packages/OneTrainer.cs b/StabilityMatrix.Core/Models/Packages/OneTrainer.cs
index d113cb2d..d4a92c34 100644
--- a/StabilityMatrix.Core/Models/Packages/OneTrainer.cs
+++ b/StabilityMatrix.Core/Models/Packages/OneTrainer.cs
@@ -41,6 +41,8 @@ public class OneTrainer(
     public override PackageDifficulty InstallerSortOrder => PackageDifficulty.Nightmare;
     public override bool OfferInOneClickInstaller => false;
     public override bool ShouldIgnoreReleases => true;
+    public override IEnumerable<PackagePrerequisite> Prerequisites =>
+        base.Prerequisites.Concat([PackagePrerequisite.Tkinter]);
 
     public override async Task InstallPackage(
         string installLocation,