diff --git a/src/Libraries/DSCPython/CPythonEvaluator.cs b/src/Libraries/DSCPython/CPythonEvaluator.cs
index a2072844833..353e6a698f0 100644
--- a/src/Libraries/DSCPython/CPythonEvaluator.cs
+++ b/src/Libraries/DSCPython/CPythonEvaluator.cs
@@ -178,7 +178,7 @@ public static object EvaluatePythonScript(
                 return null;
             }
 
-            Python.Included.Installer.SetupPython().Wait();
+            InstallPython();
 
             if (!PythonEngine.IsInitialized)
             {
@@ -246,6 +246,21 @@ public static object EvaluatePythonScript(
             }
         }
 
+        private static bool isPythonInstalled = false;
+        /// <summary>
+        /// Makes sure Python is installed on the system and it's location added to the path.
+        /// NOTE: Calling SetupPython multiple times will add the install location to the path many times,
+        /// potentially causing the environment variable to overflow.
+        /// </summary>
+        private static void InstallPython()
+        {
+            if (!isPythonInstalled)
+            {
+                Python.Included.Installer.SetupPython().Wait();
+                isPythonInstalled = true;
+            }
+        }
+
         /// <summary>
         /// Creates and initializaes the global Python scope.
         /// </summary>
diff --git a/src/PythonMigrationViewExtension/MigrationAssistant/ScriptMigrator.cs b/src/PythonMigrationViewExtension/MigrationAssistant/ScriptMigrator.cs
index 696a43146ae..3625b59e716 100644
--- a/src/PythonMigrationViewExtension/MigrationAssistant/ScriptMigrator.cs
+++ b/src/PythonMigrationViewExtension/MigrationAssistant/ScriptMigrator.cs
@@ -19,7 +19,7 @@ internal static class ScriptMigrator
         /// <returns></returns>
         internal static string MigrateCode(string code)
         {
-            Installer.SetupPython().Wait();
+            InstallPython();
 
             if (!PythonEngine.IsInitialized)
             {
@@ -70,6 +70,21 @@ internal static string MigrateCode(string code)
             }
         }
 
+        private static bool isPythonInstalled = false;
+        /// <summary>
+        /// Makes sure Python is installed on the system and it's location added to the path.
+        /// NOTE: Calling SetupPython multiple times will add the install location to the path many times,
+        /// potentially causing the environment variable to overflow.
+        /// </summary>
+        private static void InstallPython()
+        {
+            if (!isPythonInstalled)
+            {
+                Installer.SetupPython().Wait();
+                isPythonInstalled = true;
+            }
+        }
+
         private static string Get2To3MigrationScript(Assembly asm)
         {
             return GetEmbeddedScript(asm, "Dynamo.PythonMigration.MigrationAssistant.migrate_2to3.py");