diff --git a/package/win/pre-install.ps1 b/package/win/pre-install.ps1
index 79a68d8..ecd7ecd 100644
--- a/package/win/pre-install.ps1
+++ b/package/win/pre-install.ps1
@@ -5,11 +5,29 @@ param()
 
 $ErrorActionPreference = "Stop"
 
+# Validate Windows.Forms availability before using it
+$hasWinForms = $false
+try {
+    Add-Type -AssemblyName System.Windows.Forms -ErrorAction Stop
+    $hasWinForms = $true
+} catch {
+    # Constrained environment — fall back to console output only
+}
+
 function Write-Info { Write-Host $args -ForegroundColor Cyan }
 function Write-Success { Write-Host $args -ForegroundColor Green }
 function Write-Warning { Write-Host $args -ForegroundColor Yellow }
 function Write-Error { Write-Host $args -ForegroundColor Red }
 
+function Show-Dialog($msg, $title, $icon) {
+    if ($hasWinForms) {
+        [System.Windows.Forms.MessageBox]::Show($msg, $title, 
+            [System.Windows.Forms.MessageBoxButtons]::OK, $icon) | Out-Null
+    } else {
+        Write-Host "[$title] $msg" -ForegroundColor Red
+    }
+}
+
 try {
     Write-Info "=== DragonMoonlight Pre-Installation Checks ==="
     
@@ -17,11 +35,10 @@ try {
     $isElevated = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")
     if (-not $isElevated) {
         Write-Error "This script must run elevated (as Administrator). Installation cannot proceed."
-        [Windows.Forms.MessageBox]::Show(
+        Show-Dialog(
             "DragonMoonlight installation failed.`r`nThis installer requires Administrator privileges.",
             "Installation Error",
-            [Windows.Forms.MessageBoxButtons]::OK,
-            [Windows.Forms.MessageBoxIcon]::Error
+            [System.Windows.Forms.MessageBoxIcon]::Error
         )
         exit 1
     }
@@ -39,11 +56,10 @@ try {
         Write-Error "DragonMoonlight requires Windows 10 (Build 19041/2004) or later."
         Write-Error "Current build: $buildNumber"
         
-        [Windows.Forms.MessageBox]::Show(
+        Show-Dialog(
             "DragonMoonlight requires Windows 10 (Build 2004) or later.`r`n`r`nYour system is running Build $buildNumber, which does not support the required Windows Filtering Platform features for Wintun.`r`n`r`nPlease update Windows and try again.",
             "Unsupported Windows Version",
-            [Windows.Forms.MessageBoxButtons]::OK,
-            [Windows.Forms.MessageBoxIcon]::Error
+            [System.Windows.Forms.MessageBoxIcon]::Error
         )
         exit 1
     }
@@ -82,11 +98,10 @@ try {
 }
 catch {
     Write-Error "Pre-installation check failed: $_"
-    [Windows.Forms.MessageBox]::Show(
+    Show-Dialog(
         "Pre-installation check failed:`r`n`r`n$_",
         "Installation Error",
-        [Windows.Forms.MessageBoxButtons]::OK,
-        [Windows.Forms.MessageBoxIcon]::Error
+        [System.Windows.Forms.MessageBoxIcon]::Error
     )
     exit 1
 }