Upgrading TextMesh Pro from an old Unity project

//***************************************
//* TMP PRO TOOLS
//***************************************
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
using UnityEngine.SceneManagement;
using TMPro;

//********************************************
//*	NAMESPACE
//********************************************
namespace CollectiveMass{

	//********************************************
	//*	CLASS
	//********************************************
	public class TMPTools : EditorWindow {

		//********************************************
		//*	ENUM
		//********************************************

		//********************************************
		//*	CONSTANTS
		//********************************************

		//********************************************
		//*	VARIABLES
		//********************************************
		private Vector2 scrollPostion = new Vector2();

		//********************************************
		//*	LAUNCH METHOD
		//********************************************
		[MenuItem("Tools/TMP Tools")]
	    public static void Init () {
			
	        // Get existing open window or if none, make a new one:
			EditorWindow.GetWindow (typeof (TMPTools));
	    }

		//********************************************
		//*	UNITY METHODS
		//********************************************
		private void Update(){
			Repaint();
		}
	    private void OnGUI () {
			
			//*** Render
			Render();
	    }

		//********************************************
		//* MAIN METHODS
		//********************************************
		private void Render(){

			//*** start Scrolling
			scrollPostion = EditorGUILayout.BeginScrollView(scrollPostion,GUIStyle.none);

			GUILayout.Label ("Text Mesh Pro Tools", EditorStyles.boldLabel);

			//*** Space
			GUILayout.Space(20);

			//*** Rotating
			EditorGUILayout.BeginHorizontal();
			if (GUILayout.Button("Fix Rect Transforms", GUILayout.Height(30))) {
				FixRectTransforms();
			}
			EditorGUILayout.EndHorizontal();

			
			//*** End Scroll view
			EditorGUILayout.EndScrollView();
		}
		private void FixRectTransforms(){

			//*** Variables
			int i;
			int count = 0;
			List<TextMeshPro> aTMPObjects = new List<TextMeshPro>();

			//*** Get all text objects in scene
			Scene oScene = SceneManager.GetActiveScene();
			GameObject[] aRootGameObjects = oScene.GetRootGameObjects();

			//*** Loop through roots and get Text Objects
			for(i=0; i< aRootGameObjects.Length; i++){

				//*** Get Text Objects in Children
				TextMeshPro[] aTextObjects = aRootGameObjects[i].GetComponentsInChildren<TextMeshPro>();

				//*** Add to stack
				aTMPObjects.AddRange(aTextObjects);
			}

			//*** Iterate through Text objects and solve
			for(i=0; i<aTMPObjects.Count; i++){

				//*** Chgeck if it has a rect transfomr
				RectTransform oRect = aTMPObjects[i].GetComponent<RectTransform>();
				TextContainer oContainer = aTMPObjects[i].GetComponent<TextContainer>();

				//*** If does not have
				if(
					(oRect == null)
					&&(oContainer != null)
				){

					//*** Get Values
					float xWidth = oContainer.width;
					float xHeight = oContainer.height;

					//*** Add rect
					oRect = aTMPObjects[i].gameObject.AddComponent<RectTransform>();
					oRect.sizeDelta = new Vector2(xWidth, xHeight);

					//*** Remove container (Maybe check margins here)
					DestroyImmediate(oContainer);

					//*** Count successful change
					count++;
				}
			}

			//*** Tell the user that the job is done and what was done.
			EditorUtility.DisplayDialog("Text Mesh Pro Rect Transform", count + " TMP objects fixed.", "Okay");
		}
	}
}