diff --git a/README.md b/README.md
index 3caf838..1b09fe8 100644
--- a/README.md
+++ b/README.md
@@ -79,10 +79,13 @@ autoplays when you select a result.
 
 ## Get searchi
 
-**The first Windows x64 version is available.**
+**Windows x64 version 0.1.1 is available.**
 
-- [Download the Windows installer](https://tea.karlcom.de/karl/searchi/releases/download/v0.1.0/searchi_0.1.0_x64-setup.exe) — about 99 MB.
-- [Checksums](https://tea.karlcom.de/karl/searchi/releases/download/v0.1.0/SHA256SUMS.txt) · [Release notes](https://tea.karlcom.de/karl/searchi/releases/tag/v0.1.0).
+- [Download the Windows installer](https://tea.karlcom.de/karl/searchi/releases/download/v0.1.1/searchi_0.1.1_x64-setup.exe) — about 99 MB.
+- [Checksums](https://tea.karlcom.de/karl/searchi/releases/download/v0.1.1/SHA256SUMS-0.1.1.txt) · [Release notes](https://tea.karlcom.de/karl/searchi/releases/tag/v0.1.1).
+
+Already installed? Close searchi before installing the update. Version 0.1.1
+prevents duplicate desktop/model sessions when you open the app again.
 
 The installer creates a launcher and sets up WebView2 if needed. This initial
 release is unsigned. macOS and Linux packages follow; source build instructions
diff --git a/docs/ROADMAP.md b/docs/ROADMAP.md
index 220aaf4..c4ab81f 100644
--- a/docs/ROADMAP.md
+++ b/docs/ROADMAP.md
@@ -8,6 +8,9 @@ large-library checks are deferred follow-up, not blockers for this initial
 release. Keep their evidence and unchecked production gates intact.
 - [x] Publish v0.1.0 Windows installer/checksum, verify public download bytes,
   install on DEV-WIN11 and leave the app running with a desktop launcher.
+- [x] Publish Windows desktop v0.1.1 with single-instance handling; verify public
+  bytes and isolated genuine Google CPU launch. Existing user installation is
+  not automatically upgraded. See [release evidence](WINDOWS-0.1.1.md).
 
 ## Required product scope (user clarification)
 
diff --git a/docs/WINDOWS-0.1.1.md b/docs/WINDOWS-0.1.1.md
new file mode 100644
index 0000000..b88d8a7
--- /dev/null
+++ b/docs/WINDOWS-0.1.1.md
@@ -0,0 +1,40 @@
+# Windows desktop 0.1.1 release evidence
+
+Published 2026-10-13 as an unsigned prerelease:
+https://tea.karlcom.de/karl/searchi/releases/tag/v0.1.1
+
+Application source: `97c2df3b3b4922a85b66722e3d386aa79360ecdc`.
+This desktop-only version bump leaves shared engine/CLI versions unchanged.
+The installer adds the official single-instance plugin already documented in
+[launch behavior](SINGLE-INSTANCE.md); no storage schema change was introduced.
+
+- 57 frontend tests and 35 native desktop tests passed; frontend formatting
+  and embedded production build passed.
+- Normal staged worker SHA-256
+  `c01cb3ec13cfca722ee768e8350e1399a8b9a4d14a24a35adc3473a5cfc82a73`;
+  all 25 runtime DLL size/hash checks passed, including Vulkan and CPU modules.
+- Build: Tauri `build --features custom-protocol --bundles nsis`, using the
+  same local WebView2 download-bootstrapper config as the initial release.
+- Matching local archive: 39 individual file hashes verified before extraction
+  into an isolated Unicode path. App PID 19892 built generation 1 with two
+  genuine Google CPU chunks, 768 dimensions and a 6,544-byte ANN blob.
+  Launch-to-observed-generation was 18,002.04 ms in this tiny owned fixture;
+  this is not first search latency or warm p95.
+- Duplicate PID 17228 exited 0 while the original test app remained alive.
+  Only owned test processes were terminated. The installed user app PID 7716
+  and its worker PID 19864 remained alive; no automatic upgrade occurred.
+  Native visual focus/minimize restoration remains unverified.
+
+Installer `searchi_0.1.1_x64-setup.exe`: 98,947,099 bytes, SHA-256
+`0e64798bd76d5a8d13fd7a7add82c97c34f4f88a1f399ebce08d8ed15c719e6f`.
+Separate `SHA256SUMS-0.1.1.txt`: 95 bytes, SHA-256
+`bef0dfe0a8144f6dce1304c185601f6c2dea02db5943b106390d6c3c1b1cb8c7`.
+Both public unauthenticated full-byte downloads matched the local files.
+
+Ignored raw lifecycle evidence:
+`.searchi/packages/desktop-011-qa-Gemäß_日本/result.json`.
+The installer was produced but was not installed over the running user app.
+Upgrade/clean-machine install, signing, native UI interaction, macOS/Linux
+packages and actual GPU parity/fallback remain open. Gitea Actions remain
+disabled. These are not blockers for Karl's initial usable Windows release,
+and this report does not close the broader production goal.