diff --git a/.github/scripts/prefetch-tauri-nsis.ps1 b/.github/scripts/prefetch-tauri-nsis.ps1
new file mode 100644
index 00000000..79da404b
--- /dev/null
+++ b/.github/scripts/prefetch-tauri-nsis.ps1
@@ -0,0 +1,137 @@
+$ErrorActionPreference = "Stop"
+
+$nsisUrl = "https://github.com/tauri-apps/binary-releases/releases/download/nsis-3.11/nsis-3.11.zip"
+$nsisSha1 = "EF7FF767E5CBD9EDD22ADD3A32C9B8F4500BB10D"
+$tauriUtilsUrl = "https://github.com/tauri-apps/nsis-tauri-utils/releases/download/nsis_tauri_utils-v0.5.3/nsis_tauri_utils.dll"
+$tauriUtilsSha1 = "75197FEE3C6A814FE035788D1C34EAD39349B860"
+$tauriUtilsRelativePath = "Plugins\x86-unicode\additional\nsis_tauri_utils.dll"
+
+$nsisRequiredFiles = @(
+  "makensis.exe",
+  "Bin\makensis.exe",
+  "Stubs\lzma-x86-unicode",
+  "Stubs\lzma_solid-x86-unicode",
+  "Include\MUI2.nsh",
+  "Include\FileFunc.nsh",
+  "Include\x64.nsh",
+  "Include\nsDialogs.nsh",
+  "Include\WinMessages.nsh",
+  "Include\Win\COM.nsh",
+  "Include\Win\Propkey.nsh",
+  "Include\Win\RestartManager.nsh"
+)
+
+function Get-UpperSha1 {
+  param([Parameter(Mandatory = $true)][string]$Path)
+
+  return (Get-FileHash -Algorithm SHA1 -LiteralPath $Path).Hash.ToUpperInvariant()
+}
+
+function Test-FileSha1 {
+  param(
+    [Parameter(Mandatory = $true)][string]$Path,
+    [Parameter(Mandatory = $true)][string]$ExpectedSha1
+  )
+
+  return (Test-Path -LiteralPath $Path) -and ((Get-UpperSha1 -Path $Path) -eq $ExpectedSha1)
+}
+
+function Save-VerifiedDownload {
+  param(
+    [Parameter(Mandatory = $true)][string]$Uri,
+    [Parameter(Mandatory = $true)][string]$OutFile,
+    [Parameter(Mandatory = $true)][string]$ExpectedSha1
+  )
+
+  $parent = Split-Path -Parent $OutFile
+  New-Item -ItemType Directory -Force -Path $parent | Out-Null
+
+  $tempFile = "$OutFile.download"
+  for ($attempt = 1; $attempt -le 5; $attempt++) {
+    try {
+      Remove-Item -Force -ErrorAction SilentlyContinue -LiteralPath $tempFile
+      Invoke-WebRequest -Uri $Uri -OutFile $tempFile -TimeoutSec 120
+
+      $actualSha1 = Get-UpperSha1 -Path $tempFile
+      if ($actualSha1 -ne $ExpectedSha1) {
+        throw "SHA1 mismatch for $Uri. Expected $ExpectedSha1, got $actualSha1."
+      }
+
+      Move-Item -Force -LiteralPath $tempFile -Destination $OutFile
+      return
+    } catch {
+      Remove-Item -Force -ErrorAction SilentlyContinue -LiteralPath $tempFile
+      if ($attempt -eq 5) {
+        throw
+      }
+
+      $delaySeconds = [Math]::Min(30, 5 * $attempt)
+      Write-Warning "Download attempt ${attempt} failed: $($_.Exception.Message). Retrying in ${delaySeconds}s."
+      Start-Sleep -Seconds $delaySeconds
+    }
+  }
+}
+
+function Find-MissingFile {
+  param(
+    [Parameter(Mandatory = $true)][string]$Root,
+    [Parameter(Mandatory = $true)][string[]]$RelativePaths
+  )
+
+  foreach ($relativePath in $RelativePaths) {
+    if (-not (Test-Path -LiteralPath (Join-Path $Root $relativePath))) {
+      return $relativePath
+    }
+  }
+
+  return $null
+}
+
+if ([string]::IsNullOrWhiteSpace($env:LOCALAPPDATA)) {
+  throw "LOCALAPPDATA is required to resolve Tauri's Windows tool cache."
+}
+
+$tauriToolsPath = Join-Path $env:LOCALAPPDATA "tauri"
+$nsisPath = Join-Path $tauriToolsPath "NSIS"
+$downloadRoot = if ([string]::IsNullOrWhiteSpace($env:RUNNER_TEMP)) {
+  [System.IO.Path]::GetTempPath()
+} else {
+  $env:RUNNER_TEMP
+}
+
+New-Item -ItemType Directory -Force -Path $tauriToolsPath | Out-Null
+
+$missingNsisFile = Find-MissingFile -Root $nsisPath -RelativePaths $nsisRequiredFiles
+if ($missingNsisFile) {
+  Write-Host "Tauri NSIS cache is missing $missingNsisFile; downloading NSIS 3.11."
+  Remove-Item -Recurse -Force -ErrorAction SilentlyContinue -LiteralPath $nsisPath
+  Remove-Item -Recurse -Force -ErrorAction SilentlyContinue -LiteralPath (Join-Path $tauriToolsPath "nsis-3.11")
+
+  $zipPath = Join-Path $downloadRoot "nsis-3.11.zip"
+  Save-VerifiedDownload -Uri $nsisUrl -OutFile $zipPath -ExpectedSha1 $nsisSha1
+  Expand-Archive -Force -LiteralPath $zipPath -DestinationPath $tauriToolsPath
+
+  $extractedNsisPath = Join-Path $tauriToolsPath "nsis-3.11"
+  if (-not (Test-Path -LiteralPath $extractedNsisPath)) {
+    throw "Downloaded NSIS archive did not contain the expected nsis-3.11 directory."
+  }
+
+  Move-Item -Force -LiteralPath $extractedNsisPath -Destination $nsisPath
+} else {
+  Write-Host "Tauri NSIS cache already contains NSIS 3.11."
+}
+
+$tauriUtilsPath = Join-Path $nsisPath $tauriUtilsRelativePath
+if (-not (Test-FileSha1 -Path $tauriUtilsPath -ExpectedSha1 $tauriUtilsSha1)) {
+  Write-Host "Downloading Tauri NSIS utility plugin."
+  Save-VerifiedDownload -Uri $tauriUtilsUrl -OutFile $tauriUtilsPath -ExpectedSha1 $tauriUtilsSha1
+} else {
+  Write-Host "Tauri NSIS utility plugin is already cached."
+}
+
+$missingFile = Find-MissingFile -Root $nsisPath -RelativePaths ($nsisRequiredFiles + @($tauriUtilsRelativePath))
+if ($missingFile) {
+  throw "Tauri NSIS toolchain is incomplete after prefetch; missing $missingFile."
+}
+
+Write-Host "Tauri NSIS toolchain ready at $nsisPath."
diff --git a/.github/workflows/release-stable.yml b/.github/workflows/release-stable.yml
index 7e95de1c..8796e5b0 100644
--- a/.github/workflows/release-stable.yml
+++ b/.github/workflows/release-stable.yml
@@ -401,6 +401,16 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-release-cargo-x86_64-pc-windows-msvc-${{ env.RUST_TARGET_CACHE_VERSION }}-
 
+      - name: Cache Tauri Windows tools
+        uses: actions/cache@v4
+        with:
+          path: ~\AppData\Local\tauri
+          key: ${{ runner.os }}-tauri-tools-nsis-3.11-nsis-tauri-utils-0.5.3
+
+      - name: Prefetch Tauri NSIS toolchain
+        shell: pwsh
+        run: ./.github/scripts/prefetch-tauri-nsis.ps1
+
       - name: Install frontend dependencies
         run: pnpm install --frozen-lockfile
 
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index baccc3e2..0a327a41 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -455,6 +455,16 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-release-cargo-x86_64-pc-windows-msvc-${{ env.RUST_TARGET_CACHE_VERSION }}-
 
+      - name: Cache Tauri Windows tools
+        uses: actions/cache@v4
+        with:
+          path: ~\AppData\Local\tauri
+          key: ${{ runner.os }}-tauri-tools-nsis-3.11-nsis-tauri-utils-0.5.3
+
+      - name: Prefetch Tauri NSIS toolchain
+        shell: pwsh
+        run: ./.github/scripts/prefetch-tauri-nsis.ps1
+
       - name: Install frontend dependencies
         run: pnpm install --frozen-lockfile