diff --git a/Install-Dependencies.ps1 b/Install-Dependencies.ps1
index 701478c..9189a0c 100644
--- a/Install-Dependencies.ps1
+++ b/Install-Dependencies.ps1
@@ -7,6 +7,13 @@ Installs prerequisites for SharePoint XLS Converter application
 # Enable TLS 1.2 for secure connections
 [Net.ServicePointManager]::SecurityProtocol = [enum]::Parse([Net.SecurityProtocolType], "Tls12")
 
+# Verify .NET Framework 4.6+ is installed
+if (-not (Get-ChildItem 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\' | Get-ItemPropertyValue -Name Release | ForEach-Object { $_ -ge 394802 })) {
+    Write-Host "ERROR: Requires .NET Framework 4.6.2 or newer!" -ForegroundColor Red
+    Write-Host "Download from: https://dotnet.microsoft.com/download/dotnet-framework" -ForegroundColor Yellow
+    exit 1
+}
+
 Write-Host "Installing required modules..." -ForegroundColor Cyan
 
 # Install Microsoft.Graph modules
@@ -40,15 +47,16 @@ try {
     }
     
     # Install OpenXML SDK package
-    $openXmlPackage = Install-Package DocumentFormat.OpenXml -Source https://www.nuget.org/api/v2/ -Force -SkipDependencies
-    $dllPath = Join-Path $openXmlPackage.PackageSource "lib\net46\DocumentFormat.OpenXml.dll"
-    
-    if (Test-Path $dllPath) {
+    $openXmlPackage = Install-Package DocumentFormat.OpenXml -ProviderName NuGet -Force -SkipDependencies
+    $packagePath = Join-Path $env:USERPROFILE ".nuget\packages\DocumentFormat.OpenXml"
+    $dllPath = Resolve-Path (Join-Path $packagePath "*\lib\net*\DocumentFormat.OpenXml.dll") -ErrorAction SilentlyContinue | Select-Object -First 1
+
+    if ($dllPath -and (Test-Path $dllPath)) {
         Add-Type -Path $dllPath
         Write-Host "DocumentFormat.OpenXml assembly loaded successfully" -ForegroundColor Green
     }
     else {
-        throw "OpenXML DLL not found at $dllPath"
+        throw "OpenXML DLL not found in NuGet packages. Tried path: $packagePath"
     }
 }
 catch {