diff --git a/setupApps.ps1 b/setupApps.ps1
index 0bfb47d..e7409e3 100644
--- a/setupApps.ps1
+++ b/setupApps.ps1
@@ -68,26 +68,31 @@ function InstallZip {
         [string] $exe,
         [string] $app,
         [bool] $createSubfolder = $false
+        [string] $skipIf
     )
-    $zipName = [System.IO.Path]::GetFileNameWithoutExtension($zip)
-    Write-Host "Installing $zipName..."
-    $targetPath = $env:ProgramFiles
-    if ($createSubfolder) {
-        $subFolder = Join-Path $env:ProgramFiles $zipName
-        if (-not (Test-Path -Path $subFolder -PathType Container)) {
-            New-Item -Path $subFolder -ItemType Directory
+    if (-not (Test-Path -Path $skipIf -PathType Container)) {
+        $zipName = [System.IO.Path]::GetFileNameWithoutExtension($zip)
+        Write-Host "Installing $zipName..."
+        $targetPath = $env:ProgramFiles
+        if ($createSubfolder) {
+            $subFolder = Join-Path $env:ProgramFiles $zipName
+            if (-not (Test-Path -Path $subFolder -PathType Container)) {
+                New-Item -Path $subFolder -ItemType Directory
+            }
+            $targetPath = $subFolder
         }
-        $targetPath = $subFolder
+        if (Test-Path -Path (Join-Path $targetPath $app) -PathType Container) {
+            Remove-Item -Path (Join-Path $targetPath $app) -Recurse -Force
+        }
+        Expand-Archive -Path (Join-Path $tmpPath $zip) -DestinationPath $targetPath -Force
+        if (-not $zipName.Equals($app) -and (-not (Test-Path -Path (Join-Path $targetPath $app) -PathType Container))) {
+            Start-Sleep -s 2
+            Move-Item -Path (Join-Path $env:ProgramFiles $zipName) -Destination (Join-Path $env:ProgramFiles $app)
+        }
+        CreateShortcut -exe $(Join-Path -Path $env:ProgramFiles -ChildPath (Join-Path -Path $app -ChildPath $exe)) -app $app
+    } else {
+        Write-Host "$app already installed."
     }
-    if (Test-Path -Path (Join-Path $targetPath $app) -PathType Container) {
-        Remove-Item -Path (Join-Path $targetPath $app) -Recurse -Force
-    }
-    Expand-Archive -Path (Join-Path $tmpPath $zip) -DestinationPath $targetPath -Force
-    if (-not $zipName.Equals($app) -and (-not (Test-Path -Path (Join-Path $targetPath $app) -PathType Container))) {
-        Start-Sleep -s 2
-        Move-Item -Path (Join-Path $env:ProgramFiles $zipName) -Destination (Join-Path $env:ProgramFiles $app)
-    }
-    CreateShortcut -exe $(Join-Path -Path $env:ProgramFiles -ChildPath (Join-Path -Path $app -ChildPath $exe)) -app $app
 }
 
 function CreateShortcut {
@@ -141,7 +146,7 @@ function InstallApps {
             InstallExe -app "Couvac.exe"
             InstallZipMsi -zip "ChemSketch.zip" -msi "script.msi"
             InstallZipMsi -zip "Anagene.zip" -msi "Anagene.msi"
-            InstallZip -zip "EduPython.zip" -exe "EduPython.exe" -app "EduPython"
+            InstallZip -zip "EduPython.zip" -exe "EduPython.exe" -app "EduPython" -skipIf "C:\Program Files\EduPython"
             InstallZip -zip "rastop.zip" -exe "RasTop.exe" -app "RasTop"
             InstallExe -app "SalsaJ_2_3.exe"
         }