Cannot connect with the new models

I have two copies of wow cata folder, one original and one with the better models. The one with the better models started freezing on connected and giving me the "Cannot stream required archive data. Check your network connection" 3 hours ago but it worked perfectly before that. Also the one with the original models works fine. Any suggestions?

Make sure you have all the files completely downloaded. If missing any file, the client will not start because it has background downloader disabled.