diff --git a/.gitignore b/.gitignore
index d9fe42b..909f9f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -824,6 +824,7 @@ FodyWeavers.xml.bak
 *.exe
 *.pdb
 *.dll
+!EasyExtractUnitypackageRework/EasyExtractCrossPlatform/ThirdParty/EverythingSdk/Everything64.dll
 *.dylib
 
 # Other
@@ -832,4 +833,4 @@ FodyWeavers.xml.bak
 *.psess
 *.vsp
 *.vspx
-*.sap
\ No newline at end of file
+*.sap
diff --git a/EasyExtractUnitypackageRework/EasyExtractCrossPlatform.Tests/Services/EverythingSdkBootstrapperTests.cs b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform.Tests/Services/EverythingSdkBootstrapperTests.cs
index 3e212ec..19b6116 100644
--- a/EasyExtractUnitypackageRework/EasyExtractCrossPlatform.Tests/Services/EverythingSdkBootstrapperTests.cs
+++ b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform.Tests/Services/EverythingSdkBootstrapperTests.cs
@@ -118,7 +118,8 @@ public async Task EnsureDllForTestsAsync_ReusesValidExistingDllWithoutRewrite()
         EverythingSdkBootstrapper.ConfigureForTests(
             appDataPathOverride: () => appDataPath,
             validateDllHashOverride: (path, _) =>
-                string.Equals(Path.GetFullPath(path), Path.GetFullPath(dllPath), StringComparison.OrdinalIgnoreCase));
+                string.Equals(Path.GetFullPath(path), Path.GetFullPath(dllPath), StringComparison.OrdinalIgnoreCase),
+            localProbeDirectoriesOverride: () => new[] { sdkDirectory });
 
         var resolvedPath = await EverythingSdkBootstrapper.EnsureDllForTestsAsync();
         var currentWriteTime = File.GetLastWriteTimeUtc(dllPath);
@@ -132,7 +133,7 @@ public async Task EnsureDllForTestsAsync_ReusesValidExistingDllWithoutRewrite()
     }
 
     [Fact]
-    public async Task EnsureDllForTestsAsync_SerializesConcurrentReuseWhileValidationRetries()
+    public async Task EnsureDllForTestsAsync_SerializesConcurrentBundledDllResolution()
     {
         if (!OperatingSystem.IsWindows())
             return;
@@ -160,11 +161,10 @@ public async Task EnsureDllForTestsAsync_SerializesConcurrentReuseWhileValidatio
                         StringComparison.OrdinalIgnoreCase))
                     return true;
 
-                if (Interlocked.Increment(ref validationAttempts) == 1)
-                    throw new SharingViolationIOException();
-
+                Interlocked.Increment(ref validationAttempts);
                 return true;
-            });
+            },
+            localProbeDirectoriesOverride: () => new[] { sdkDirectory });
 
         var callers = Enumerable.Range(0, 4)
             .Select(_ => EverythingSdkBootstrapper.EnsureDllForTestsAsync())
@@ -173,13 +173,13 @@ public async Task EnsureDllForTestsAsync_SerializesConcurrentReuseWhileValidatio
         var resolvedPaths = await Task.WhenAll(callers);
 
         Assert.All(resolvedPaths, path => Assert.Equal(dllPath, path, true));
-        Assert.True(validationAttempts >= 2);
+        Assert.Equal(1, validationAttempts);
 
         Directory.Delete(root, true);
     }
 
     [Fact]
-    public async Task EnsureDllForTestsAsync_CleansOrphanedTemporaryDlls()
+    public async Task EnsureDllForTestsAsync_LeavesUnrelatedTemporaryFilesUntouched()
     {
         if (!OperatingSystem.IsWindows())
             return;
@@ -214,12 +214,13 @@ public async Task EnsureDllForTestsAsync_CleansOrphanedTemporaryDlls()
 
                 return string.Equals(Path.GetFullPath(path), Path.GetFullPath(dllPath),
                     StringComparison.OrdinalIgnoreCase);
-            });
+            },
+            localProbeDirectoriesOverride: () => new[] { sdkDirectory });
 
         var resolvedPath = await EverythingSdkBootstrapper.EnsureDllForTestsAsync();
 
         Assert.Equal(dllPath, resolvedPath, true);
-        Assert.False(File.Exists(orphanedTempPath));
+        Assert.True(File.Exists(orphanedTempPath));
 
         Directory.Delete(root, true);
     }
@@ -291,6 +292,18 @@ public void IsTransientDownloadFailure_TruncatedHttpResponse_IsRetryable()
         Assert.True(EverythingSdkBootstrapper.IsTransientDownloadFailure(exception));
     }
 
+    [Fact]
+    public async Task EnsureDllForTestsAsync_MissingBundledDll_DoesNotDownload()
+    {
+        if (!OperatingSystem.IsWindows())
+            return;
+
+        EverythingSdkBootstrapper.ResetForTests();
+        EverythingSdkBootstrapper.ConfigureForTests(localProbeDirectoriesOverride: Array.Empty<string>);
+
+        await Assert.ThrowsAsync<FileNotFoundException>(() => EverythingSdkBootstrapper.EnsureDllForTestsAsync());
+    }
+
     [Fact]
     public async Task EnsureDllForTestsAsync_FallsBackToDllNextToTheExecutable()
     {
@@ -368,4 +381,4 @@ public SharingViolationIOException() : base("Simulated sharing violation")
             HResult = SharingViolationHResult;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/EasyExtractCrossPlatform.csproj b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/EasyExtractCrossPlatform.csproj
index f78d31c..f631468 100644
--- a/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/EasyExtractCrossPlatform.csproj
+++ b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/EasyExtractCrossPlatform.csproj
@@ -48,6 +48,14 @@
     <ItemGroup>
         <AvaloniaResource Include="Assets\**" />
     </ItemGroup>
+    <ItemGroup>
+        <None Remove="ThirdParty\EverythingSdk\Everything64.dll" />
+        <Content Include="ThirdParty\EverythingSdk\Everything64.dll">
+            <TargetPath>Everything64.dll</TargetPath>
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+            <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
+        </Content>
+    </ItemGroup>
     <ItemGroup>
         <ProjectReference Include="..\EasyExtract.Core\EasyExtract.Core.csproj" />
     </ItemGroup>
diff --git a/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/Services/EverythingSdkBootstrapper.cs b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/Services/EverythingSdkBootstrapper.cs
index d31c357..85d756f 100644
--- a/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/Services/EverythingSdkBootstrapper.cs
+++ b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/Services/EverythingSdkBootstrapper.cs
@@ -13,6 +13,7 @@ internal static class EverythingSdkBootstrapper
     private static readonly TimeSpan DllPromotionInitialDelay = TimeSpan.FromMilliseconds(40);
     private static readonly TimeSpan DownloadInitialRetryDelay = TimeSpan.FromMilliseconds(500);
 
+    // Legacy helpers and their tests remain below, but EnsureDllAsync no longer calls the network path.
     private static readonly Uri SdkDownloadUri = new("https://www.voidtools.com/Everything-SDK.zip");
     private static readonly HttpClient HttpClient = new();
     private static readonly SemaphoreSlim DllInstallGate = new(1, 1);
@@ -24,7 +25,7 @@ internal static class EverythingSdkBootstrapper
     private static readonly IReadOnlyDictionary<string, string> ExpectedDllHashes =
         new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
         {
-            ["Everything64.dll"] = "C7AB8B47F7DD4C41AA735F4BA40B35AD5460A86FA7ABE0C94383F12BCE33BFB6",
+            ["Everything64.dll"] = "81B5BE18126ACD2C2B913F8F4A821E476B18393CDD3DEBD03387C50AFD8DB88F",
             ["Everything32.dll"] = "C28CD066AF36CAE4403A9933847AFF01DB928787D86751F014A1FA60D8B97FDA"
         };
 
@@ -105,42 +106,17 @@ private static async Task<string> EnsureDllAsync()
             return _everythingDllPath;
         }
 
-        var appData = (_appDataPathOverride?.Invoke() ??
-                       Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)).Trim();
-        var sdkDirectory = Path.Combine(appData, "EasyExtract", "ThirdParty", "EverythingSdk");
-        Directory.CreateDirectory(sdkDirectory);
-
-        var dllPath = Path.Combine(sdkDirectory, TargetDllFileName);
-
         await DllInstallGate.WaitAsync().ConfigureAwait(false);
         try
         {
-            CleanupOrphanedTemporaryDlls(sdkDirectory);
-
-            if (_everythingDllPath is { Length: > 0 } existingPath && File.Exists(existingPath))
-            {
-                LoggingService.LogInformation($"Everything SDK DLL already present at '{existingPath}'.");
-                return existingPath;
-            }
-
-            if (await TryReuseExistingDllAsync(dllPath).ConfigureAwait(false))
-            {
-                _everythingDllPath = dllPath;
-                return dllPath;
-            }
-
-            // The error messages tell users to drop the SDK DLL next to the executable, so honour
-            // that before going to the network. It is also the only way out on an offline machine.
             if (TryUseLocallyShippedDll(out var localDllPath))
             {
                 _everythingDllPath = localDllPath;
                 return localDllPath;
             }
 
-            await DownloadDllWithRetryAsync(sdkDirectory, dllPath).ConfigureAwait(false);
-
-            _everythingDllPath = dllPath;
-            return dllPath;
+            throw new FileNotFoundException(
+                $"Bundled {TargetDllFileName} was not found next to the EasyExtract executable.");
         }
         finally
         {
@@ -594,4 +570,4 @@ internal static bool ValidateDllHashForTests(string dllPath, bool deleteOnMismat
     {
         return ValidateDllHash(dllPath, deleteOnMismatch);
     }
-}
\ No newline at end of file
+}
diff --git a/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/ThirdParty/EverythingSdk/Everything64.dll b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/ThirdParty/EverythingSdk/Everything64.dll
new file mode 100644
index 0000000..1df08c3
Binary files /dev/null and b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/ThirdParty/EverythingSdk/Everything64.dll differ
diff --git a/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/ThirdParty/EverythingSdk/README.md b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/ThirdParty/EverythingSdk/README.md
new file mode 100644
index 0000000..b18c0ba
--- /dev/null
+++ b/EasyExtractUnitypackageRework/EasyExtractCrossPlatform/ThirdParty/EverythingSdk/README.md
@@ -0,0 +1,9 @@
+# Everything SDK runtime
+
+`Everything64.dll` is bundled next to the Windows executable at build and publish time.
+It is the x64 file from the Voidtools Everything SDK archive verified on 2026-08-22.
+
+- SHA-256: `81B5BE18126ACD2C2B913F8F4A821E476B18393CDD3DEBD03387C50AFD8DB88F`
+- Size: 91,304 bytes
+
+The application validates this exact hash and does not download an SDK DLL at runtime.