diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10b5637..d430318 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,14 @@ The release workflow publishes the section that matches the tag as the
 GitHub release notes, so each version gets a heading of the form
 `## X.Y.Z (date)`.
 
+## 4.1.1 (2026-10-02)
+
+- Setting up a Windows PC that an earlier version had set up (when the
+  app was called BroLink) now registers the `LatchStream` service. Setup
+  moved the engine's folder and removed the old service, but treated the
+  running engine as needing nothing more, so the new service was never
+  registered and the engine ran only once someone had signed in.
+
 ## 4.1.0 (2026-10-02)
 
 - **BroLink is now Latch, by Bardbro.** The app, the repository
diff --git a/Cargo.lock b/Cargo.lock
index 195261e..a5c05c9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2114,7 +2114,7 @@ dependencies = [
 
 [[package]]
 name = "latch-client"
-version = "4.1.0"
+version = "4.1.1"
 dependencies = [
  "anyhow",
  "eframe",
@@ -2137,7 +2137,7 @@ dependencies = [
 
 [[package]]
 name = "latch-core"
-version = "4.1.0"
+version = "4.1.1"
 dependencies = [
  "anyhow",
  "directories",
@@ -2155,7 +2155,7 @@ dependencies = [
 
 [[package]]
 name = "latch-host"
-version = "4.1.0"
+version = "4.1.1"
 dependencies = [
  "anyhow",
  "arboard",
@@ -2180,7 +2180,7 @@ dependencies = [
 
 [[package]]
 name = "latch-stream"
-version = "4.1.0"
+version = "4.1.1"
 dependencies = [
  "aes",
  "aes-gcm",
@@ -2203,7 +2203,7 @@ dependencies = [
 
 [[package]]
 name = "latch-ui"
-version = "4.1.0"
+version = "4.1.1"
 dependencies = [
  "egui",
  "latch-core",
diff --git a/Cargo.toml b/Cargo.toml
index d37bdff..ddee38c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ members = [
 ]
 
 [workspace.package]
-version = "4.1.0"
+version = "4.1.1"
 edition = "2021"
 license = "GPL-3.0-or-later"
 authors = ["Latch Contributors"]
diff --git a/crates/client/src/stream.rs b/crates/client/src/stream.rs
index 047c7cd..6d5d416 100644
--- a/crates/client/src/stream.rs
+++ b/crates/client/src/stream.rs
@@ -2105,7 +2105,7 @@ pub(crate) mod tests {
                     v
                 },
                 Extra {
-                    handover: Some("Installing Latch Host 4.1.0 on Gaming-PC: waiting for it to fetch the file…".into()),
+                    handover: Some("Installing Latch Host 4.1.1 on Gaming-PC: waiting for it to fetch the file…".into()),
                     ..windows()
                 },
                 None,
diff --git a/crates/host/src/app.rs b/crates/host/src/app.rs
index 7b1d24c..fbabb86 100644
--- a/crates/host/src/app.rs
+++ b/crates/host/src/app.rs
@@ -213,7 +213,10 @@ impl HostApp {
         }
         let cfg = self.cfg.clone();
         let ctx = ctx.clone();
-        let install_engine = !status.streamer.installed || migrate || !status.streamer.running;
+        let install_engine = !status.streamer.installed
+            || migrate
+            || !status.streamer.running
+            || crate::streamer::find().is_some_and(|i| crate::streamer::in_old_folder(&i));
         let adapter = status.wake_adapter.clone();
         let desc = status.wake_adapter_description.clone();
         std::thread::spawn(move || {
@@ -1249,7 +1252,7 @@ mod snapshots {
             }),
             setup: vec![],
             log: vec![
-                "Latch 4.1.0 listening on TCP 47850".into(),
+                "Latch 4.1.1 listening on TCP 47850".into(),
                 "listening for wake packets on UDP 9".into(),
                 "Tailscale up as user@example.com (100.64.0.10)".into(),
                 "the streaming engine is running and Latch is signed in".into(),
diff --git a/crates/host/src/setup.rs b/crates/host/src/setup.rs
index d75adb4..59863cd 100644
--- a/crates/host/src/setup.rs
+++ b/crates/host/src/setup.rs
@@ -692,9 +692,10 @@ pub fn run_as_admin() -> Result<()> {
         let kind = install.as_ref().map(|i| i.kind).unwrap_or("");
         let migrate = crate::migrate::uses_old_engine(kind);
         let running = install.is_some() && crate::streamer::running();
+        let old_folder = install.as_ref().is_some_and(crate::streamer::in_old_folder);
         let plan = Plan {
             exe: &exe,
-            install_engine: install.is_none() || migrate || !running,
+            install_engine: install.is_none() || migrate || !running || old_folder,
             migrate,
             dry_run: false,
             sunshine_user: &cfg.sunshine_user,
diff --git a/crates/host/src/streamer.rs b/crates/host/src/streamer.rs
index 690c506..d90ef5c 100644
--- a/crates/host/src/streamer.rs
+++ b/crates/host/src/streamer.rs
@@ -6,7 +6,7 @@
 use anyhow::{bail, Context, Result};
 use latch_core::{SUNSHINE_PORT, SUNSHINE_WEB_PORT};
 use std::net::{SocketAddr, TcpStream};
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::process::Command;
 use std::time::Duration;
 
@@ -25,6 +25,13 @@ pub const INSTALL_DIRS: [(&str, &str); 4] = [
     ("Apollo", r"C:\Program Files\Apollo"),
 ];
 
+/// Whether `install` is the engine in the folder an earlier version used.
+/// Setup moves it to [`ENGINE_DIR`] and registers the service under its new
+/// name, so it has to run the engine step even though an engine is up.
+pub fn in_old_folder(install: &Install) -> bool {
+    install.dir.as_path() == Path::new(crate::legacy::WINDOWS_ENGINE_DIR)
+}
+
 /// GitHub repository the setup script fetches the engine archive from.
 pub const REPO: &str = "LizardByte/Sunshine";
 
@@ -580,6 +587,20 @@ mod tests {
         let _ = SUNSHINE_PORT;
     }
 
+    #[test]
+    fn an_engine_in_the_old_folder_is_recognised_so_setup_moves_it() {
+        let old = Install {
+            kind: "Latch",
+            dir: PathBuf::from(crate::legacy::WINDOWS_ENGINE_DIR),
+        };
+        let new = Install {
+            kind: "Latch",
+            dir: PathBuf::from(ENGINE_DIR),
+        };
+        assert!(in_old_folder(&old));
+        assert!(!in_old_folder(&new));
+    }
+
     #[test]
     fn session_listed_reads_current_app_and_running_flags() {
         assert!(!session_listed(&serde_json::json!({"apps": []})));