I have downloaded the wotlk 3.3.5 folder, both the new and the old one several times now and it seems like something always goes wrong whilst installing. My wow folder also looks very weird, i think the problem is that some of the files in the folder opens in the wrong program but i'm not sure. Here is a screenshot of the folder
https://gyazo.com/b7f30b2271c5b902100506ad23ce6f35
Thank you, best regards Erik.