diff --git a/farmq-install-en.ps1 b/farmq-install-en.ps1
index 79583fa..8a69f4d 100644
--- a/farmq-install-en.ps1
+++ b/farmq-install-en.ps1
@@ -111,43 +111,63 @@ function Install-Tailscale {
     
     Write-Info "Installing Tailscale for Windows..."
 
-    # Always use the 'latest' installer from the official stable channel.
+    # Use the official MSI from the 'latest' stable channel and install it with
+    # msiexec /quiet. The previous approach (tailscale-setup-latest.exe /S) is the
+    # NSIS GUI installer; its silent switch does NOT reliably register the
+    # 'Tailscale' service or drop tailscale.exe before the script continues, which
+    # caused "service not found" / "executable not found" right after install.
+    # The MSI installs the service synchronously and is the supported unattended path.
     # NOTE: GitHub's "latest release" tag and pkgs.tailscale.com/stable can be out
-    # of sync (e.g. GitHub reports 1.98.3 while stable already serves 1.98.4), so
-    # building a versioned URL such as tailscale-setup-<version>.exe results in a
-    # 404. The 'latest' alias always exists, so we use it directly.
-    $downloadUrl = "https://pkgs.tailscale.com/stable/tailscale-setup-latest.exe"
-    $tempPath = "$env:TEMP\tailscale-setup-latest.exe"
-    
+    # of sync, so we use the version-less 'latest' alias which always exists.
+    $downloadUrl = "https://pkgs.tailscale.com/stable/tailscale-setup-latest-amd64.msi"
+    $tempPath = "$env:TEMP\tailscale-setup-latest.msi"
+    $logPath = "$env:TEMP\tailscale-install.log"
+
     try {
         Write-Status "Downloading Tailscale from: $downloadUrl"
         Invoke-WebRequest -Uri $downloadUrl -OutFile $tempPath -UseBasicParsing
-        
+
         Write-Status "Installing Tailscale... (please wait)"
-        Start-Process -FilePath $tempPath -ArgumentList "/S" -Wait
-        
+        $proc = Start-Process -FilePath "msiexec.exe" `
+            -ArgumentList "/i", "`"$tempPath`"", "/quiet", "/norestart", "/l*v", "`"$logPath`"" `
+            -Wait -PassThru
+        # 0 = success, 3010 = success but reboot required
+        if ($proc.ExitCode -ne 0 -and $proc.ExitCode -ne 3010) {
+            throw "msiexec returned exit code $($proc.ExitCode). See log: $logPath"
+        }
+
         # Refresh PATH environment variable
         $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
-        
-        # Verify installation
-        Start-Sleep -Seconds 3
-        $tailscaleInstalled = Get-Command "tailscale" -ErrorAction SilentlyContinue
-        if (-not $tailscaleInstalled) {
-            # Try direct path
-            $tailscaleExe = "C:\Program Files\Tailscale\tailscale.exe"
-            if (Test-Path $tailscaleExe) {
-                # Add Tailscale to PATH
-                $currentPath = [Environment]::GetEnvironmentVariable("Path", "Machine")
-                if ($currentPath -notlike "*Tailscale*") {
-                    [Environment]::SetEnvironmentVariable("Path", "$currentPath;C:\Program Files\Tailscale", "Machine")
-                    $env:Path = "$env:Path;C:\Program Files\Tailscale"
-                }
+
+        # Make sure the install dir is on PATH for this session
+        $tailscaleExe = "C:\Program Files\Tailscale\tailscale.exe"
+        if (Test-Path $tailscaleExe) {
+            $currentPath = [Environment]::GetEnvironmentVariable("Path", "Machine")
+            if ($currentPath -notlike "*Tailscale*") {
+                [Environment]::SetEnvironmentVariable("Path", "$currentPath;C:\Program Files\Tailscale", "Machine")
+            }
+            if ($env:Path -notlike "*Tailscale*") {
+                $env:Path = "$env:Path;C:\Program Files\Tailscale"
             }
         }
-        
+
+        # Wait for tailscale.exe to actually appear (install can lag a few seconds)
+        Write-Status "Waiting for Tailscale to be ready..."
+        $ready = $false
+        for ($i = 0; $i -lt 15; $i++) {
+            if ((Get-Command "tailscale" -ErrorAction SilentlyContinue) -or (Test-Path $tailscaleExe)) {
+                $ready = $true
+                break
+            }
+            Start-Sleep -Seconds 2
+        }
+        if (-not $ready) {
+            throw "Tailscale executable did not appear after installation. See log: $logPath"
+        }
+
         Remove-Item $tempPath -Force -ErrorAction SilentlyContinue
         Write-Success "Tailscale installation completed"
-        
+
     }
     catch {
         Write-Error "Tailscale installation failed: $($_.Exception.Message)"
@@ -162,8 +182,15 @@ function Start-TailscaleService {
     Write-Status "Starting Tailscale service..."
     
     try {
-        # Start Tailscale service
-        $service = Get-Service -Name "Tailscale" -ErrorAction SilentlyContinue
+        # The MSI registers a service named "Tailscale"; it may take a few seconds
+        # to appear, so poll for it before giving up.
+        $service = $null
+        for ($i = 0; $i -lt 15; $i++) {
+            $service = Get-Service -Name "Tailscale" -ErrorAction SilentlyContinue
+            if ($service) { break }
+            Start-Sleep -Seconds 2
+        }
+
         if ($service) {
             if ($service.Status -ne "Running") {
                 Start-Service -Name "Tailscale"
@@ -171,7 +198,19 @@ function Start-TailscaleService {
             }
             Write-Success "Tailscale service is running."
         } else {
+            # Fall back to launching tailscaled directly if the service is missing
             Write-Warning "Tailscale service not found. Attempting manual start..."
+            $tailscaled = "C:\Program Files\Tailscale\tailscaled.exe"
+            if (Test-Path $tailscaled) {
+                Start-Process -FilePath $tailscaled -ArgumentList "install" -Wait -ErrorAction SilentlyContinue
+                Start-Sleep -Seconds 3
+                $service = Get-Service -Name "Tailscale" -ErrorAction SilentlyContinue
+                if ($service -and $service.Status -ne "Running") {
+                    Start-Service -Name "Tailscale" -ErrorAction SilentlyContinue
+                    Start-Sleep -Seconds 3
+                }
+                if ($service) { Write-Success "Tailscale service is running." }
+            }
         }
     }
     catch {
diff --git a/farmq-install.ps1 b/farmq-install.ps1
index 7f5b232..4143190 100644
--- a/farmq-install.ps1
+++ b/farmq-install.ps1
@@ -117,43 +117,62 @@ function Install-Tailscale {
     
     Write-Info "Windows용 Tailscale 설치 중..."
 
-    # 공식 stable 채널의 'latest' 설치 파일을 항상 사용한다.
-    # 주의: GitHub "최신 릴리스" 태그와 pkgs.tailscale.com/stable 채널 버전이
-    # 어긋날 수 있다(예: GitHub=1.98.3 인데 stable=1.98.4). 그래서
-    # tailscale-setup-<버전>.exe 식으로 URL을 조립하면 404가 난다.
-    # 'latest' 별칭은 항상 존재하므로 이걸 직접 사용한다.
-    $downloadUrl = "https://pkgs.tailscale.com/stable/tailscale-setup-latest.exe"
-    $tempPath = "$env:TEMP\tailscale-setup-latest.exe"
-    
+    # 공식 stable 채널의 'latest' MSI를 msiexec /quiet 로 설치한다.
+    # 이전 방식(tailscale-setup-latest.exe /S)은 NSIS GUI 인스톨러로, 사일런트
+    # 스위치가 'Tailscale' 서비스나 tailscale.exe 를 스크립트 진행 전에 확실히
+    # 설치하지 못해 설치 직후 "service not found" / "executable not found" 오류가
+    # 발생했다. MSI는 서비스를 동기적으로 설치하는 공식 무인 설치 경로다.
+    # 주의: GitHub "최신 릴리스" 태그와 stable 채널 버전이 어긋날 수 있으므로
+    # 버전 없는 'latest' 별칭을 사용한다(항상 존재함).
+    $downloadUrl = "https://pkgs.tailscale.com/stable/tailscale-setup-latest-amd64.msi"
+    $tempPath = "$env:TEMP\tailscale-setup-latest.msi"
+    $logPath = "$env:TEMP\tailscale-install.log"
+
     try {
         Write-Status "Tailscale 다운로드 중: $downloadUrl"
         Invoke-WebRequest -Uri $downloadUrl -OutFile $tempPath -UseBasicParsing
-        
+
         Write-Status "Tailscale 설치 중... (잠시 기다려주세요)"
-        Start-Process -FilePath $tempPath -ArgumentList "/S" -Wait
-        
+        $proc = Start-Process -FilePath "msiexec.exe" `
+            -ArgumentList "/i", "`"$tempPath`"", "/quiet", "/norestart", "/l*v", "`"$logPath`"" `
+            -Wait -PassThru
+        # 0 = 성공, 3010 = 성공(재부팅 필요)
+        if ($proc.ExitCode -ne 0 -and $proc.ExitCode -ne 3010) {
+            throw "msiexec 종료 코드 $($proc.ExitCode). 로그: $logPath"
+        }
+
         # PATH 환경변수 새로고침
         $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
-        
-        # 설치 확인
-        Start-Sleep -Seconds 3
-        $tailscaleInstalled = Get-Command "tailscale" -ErrorAction SilentlyContinue
-        if (-not $tailscaleInstalled) {
-            # 직접 경로 시도
-            $tailscaleExe = "C:\Program Files\Tailscale\tailscale.exe"
-            if (Test-Path $tailscaleExe) {
-                # PATH에 Tailscale 경로 추가
-                $currentPath = [Environment]::GetEnvironmentVariable("Path", "Machine")
-                if ($currentPath -notlike "*Tailscale*") {
-                    [Environment]::SetEnvironmentVariable("Path", "$currentPath;C:\Program Files\Tailscale", "Machine")
-                    $env:Path = "$env:Path;C:\Program Files\Tailscale"
-                }
+
+        # 이번 세션 PATH에 설치 경로 보장
+        $tailscaleExe = "C:\Program Files\Tailscale\tailscale.exe"
+        if (Test-Path $tailscaleExe) {
+            $currentPath = [Environment]::GetEnvironmentVariable("Path", "Machine")
+            if ($currentPath -notlike "*Tailscale*") {
+                [Environment]::SetEnvironmentVariable("Path", "$currentPath;C:\Program Files\Tailscale", "Machine")
+            }
+            if ($env:Path -notlike "*Tailscale*") {
+                $env:Path = "$env:Path;C:\Program Files\Tailscale"
             }
         }
-        
+
+        # tailscale.exe 가 실제로 나타날 때까지 대기 (설치가 몇 초 지연될 수 있음)
+        Write-Status "Tailscale 준비 대기 중..."
+        $ready = $false
+        for ($i = 0; $i -lt 15; $i++) {
+            if ((Get-Command "tailscale" -ErrorAction SilentlyContinue) -or (Test-Path $tailscaleExe)) {
+                $ready = $true
+                break
+            }
+            Start-Sleep -Seconds 2
+        }
+        if (-not $ready) {
+            throw "설치 후 Tailscale 실행 파일을 찾을 수 없습니다. 로그: $logPath"
+        }
+
         Remove-Item $tempPath -Force -ErrorAction SilentlyContinue
         Write-Success "Tailscale 설치 완료"
-        
+
     }
     catch {
         Write-Error "Tailscale 설치 실패: $($_.Exception.Message)"