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diff --git a/packaging/win/build-win.ps1 b/packaging/win/build-win.ps1
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+<#
+.SYNOPSIS
+    Build the Windows installer: Electron client + bundled Python node.
+
+.DESCRIPTION
+    The Windows counterpart of packaging/build/build-client.sh. Produces a
+    single per-user NSIS installer (MeshBay-Setup-<version>.exe) that lays down
+    the Electron app and, beside it under resources/node-runtime/, the frozen
+    meshbay-node daemon. No hub -- a desktop machine installs client + node
+    (+ common, which is inside the node runtime).
+
+    Steps:
+      1. Node >= 22 check
+      2. npm ci  (+ approve Electron's install script, download Chromium)
+      3. bump Electron to the latest release  (Chromium CVE policy -- see
+         build-client.sh; skip with -NoElectronBump)
+      4. npm run sync-ui        (copy the interface from the hub package)
+      5. build-node-runtime.ps1 (PyInstaller freeze of the daemon)
+      6. electron-builder --win nsis
+
+.PARAMETER FfmpegDir
+    Passed through to build-node-runtime.ps1 -- directory with ffmpeg.exe /
+    ffprobe.exe to bundle. Optional; without it the node uses PATH.
+
+.PARAMETER NoElectronBump
+    Keep the pinned Electron instead of upgrading to the latest release.
+
+.PARAMETER SkipNodeRuntime
+    Reuse an existing packages/meshbay-client/node-runtime/ (faster iteration
+    on the electron-builder side).
+#>
+[CmdletBinding()]
+param(
+    [string]$FfmpegDir = $env:MESHBAY_FFMPEG_DIR,
+    [switch]$NoElectronBump,
+    [switch]$SkipNodeRuntime
+)
+
+$ErrorActionPreference = "Stop"
+Set-StrictMode -Version Latest
+
+$WinDir = $PSScriptRoot
+$Repo   = (Resolve-Path (Join-Path $WinDir "..\..")).Path
+$Client = Join-Path $Repo "packages\meshbay-client"
+
+function Step($msg) { Write-Host "==> $msg" -ForegroundColor Cyan }
+
+# --- 1. Node -------------------------------------------------------------
+if (-not (Get-Command node -ErrorAction SilentlyContinue)) {
+    throw "Node.js not found. Install Node 22 or newer from nodejs.org."
+}
+$nodeMajor = [int](& node -e "process.stdout.write(String(process.versions.node.split('.')[0]))")
+if ($nodeMajor -lt 22) { throw "Node $nodeMajor is too old -- need 22 or newer for Electron" }
+Step "Node $(& node --version)"
+
+Push-Location $Client
+try {
+    # --- 2. deps ------------------------------------------------------
+    Step "npm ci"
+    & npm ci --ignore-scripts
+    if ($LASTEXITCODE -ne 0) { throw "npm ci failed" }
+
+    # --- 3. Electron: build against the latest release --------------
+    # Writes package.json + package-lock.json, so the build leaves the repo
+    # dirty on purpose -- commit the new pin.
+    if (-not $NoElectronBump) {
+        Step "checking for a newer Electron"
+        $bumped = & node (Join-Path $WinDir "bump-electron.mjs")
+        if ($LASTEXITCODE -ne 0) { throw "electron bump failed" }
+        if ($bumped) {
+            Write-Host "    Electron -> $bumped  (package.json + lock updated, commit them)" -ForegroundColor Yellow
+        } else {
+            Write-Host "    Electron is already current"
+        }
+    }
+
+    Step "downloading Electron's Chromium"
+    & npm approve-scripts electron 2>$null
+    & node node_modules/electron/install.js
+
+    # --- 4. UI -----------------------------------------------------
+    Step "npm run sync-ui"
+    & npm run sync-ui
+    if ($LASTEXITCODE -ne 0) { throw "sync-ui failed" }
+
+    # --- 5. node runtime ---------------------------------------
+    $rtExe = Join-Path $Client "node-runtime\meshbay-node.exe"
+    if ($SkipNodeRuntime -and (Test-Path $rtExe)) {
+        Step "reusing existing node-runtime/"
+    } else {
+        Step "building the bundled node (PyInstaller)"
+        $rtArgs = @{}
+        if ($FfmpegDir) { $rtArgs["FfmpegDir"] = $FfmpegDir }
+        & (Join-Path $WinDir "build-node-runtime.ps1") @rtArgs
+        if ($LASTEXITCODE -ne 0) { throw "build-node-runtime.ps1 failed" }
+    }
+
+    # --- 6. installer ---------------------------------------
+    Step "electron-builder --win nsis"
+    & npx electron-builder --win nsis
+    if ($LASTEXITCODE -ne 0) { throw "electron-builder failed" }
+}
+finally {
+    Pop-Location
+}
+
+$setup = Get-ChildItem (Join-Path $Client "dist") -Filter "*Setup*.exe" -ErrorAction SilentlyContinue |
+    Sort-Object LastWriteTime | Select-Object -Last 1
+Write-Host ""
+if ($setup) {
+    Write-Host "OK  installer: $($setup.FullName)" -ForegroundColor Green
+    Write-Host ("    ({0:N0} MB)" -f ($setup.Length / 1MB))
+}
+else {
+    Write-Host "!!  no *Setup*.exe found in $Client\dist" -ForegroundColor Red
+    exit 1
+}