I cant login

I downloaded the Wrath of the Lich King client from https://www.warmane.com/download and when I log in game it shows me the messagge: "Your account is authorized for the Wrath of the Lich King expansion, but the computer you play on does not contain WotLK data...."

I have the version 3.3.5 12340

Thanks for the help!

I'd recomend moving the game away from the downlaod folder to anywhere else, then right click the wow folder, properties, uncheck read only.