Problem instalation

Hello I'm doing this post to ask how I instaler '' wow wotlk 3.3.5 "but I did the update 4.0.0 I think I should not have to do it, suddenly I quan connect myself after that log wonder uppdate, but it makes me impossible that loop play, I should do what, reinstaler the games without making update?

and have this message after donwload patch 4.0.0...

The file "C:\Users\alexis\Desktop\Wrath of the Lich King 3.3.5a\WoW.exe" is read only and cannot be overwritten. Please try installing to a different location. (ConflictManager::DeleteFile)

If you intend on playing Wrath of the Lich King, yes, you will need to reinstall. In the future, make sure you log in with your Warmane account information and NOT your email.