Update fail

I cant figure out how to downgrade i have windows 7 and tut did not help plz help me i cnt play Herculesx

Start
1. First Go Open Up your Start Menu

2. Go To My Computer

3. Open The Local Disk

4. Open the Program Files folder

5. Find Your World Of Warcraft folder (this is what people call the wow directory) and open it

6. Now Open Up the Data folder

7. Delete the patch.MPQ file and the patch-2.MPQ

8. Go Back To Your Wow Directory and Now Run The Repair Program

9. Choose Reset And Check Files (it should say wow is damaged,something like that)

10. Let it Repair

11. Go multitask while you wait (personal suggestion)

12. When Its Done Start Wow And login it Should Take You Back and Start updating the patches

13. Once Its Up to The Patch you Want Let it install it But then close everything and Dont Let It Continue

14. Change Your Realmlist Again

15. Go To Your Wow Directory And Open The Wow Program and congratulations You downgraded to the patch you wanted

YOU MUST ALWAYS OPEN WOW WITH THE WOW PROGRAM FROM YOUR DIRECTORY
IF YOU WANT TO STAY DOWNGRADED

otherwise it will attempt to auto update