Issues with connecting to servers (Cataclysm)

I played on warmane in June last time, and i never had a problem like this. Yesterday i downloaded Cataclysm downloader (not torrent file, but that 18Mb installer) and i successfully logged in, then i was redirected to Realm choosing menu. I chose Neltharion, but it only said ''Connected'' and then game crashed. Happens every time.
My Realmlist.wtf is good, and i can't find any possible way to solve the issue.

Please help me or redirect me to someone who can. Thank you very much.

EDIT: My friend had the same problem 'till he downloaded new Client via torrent. I have problems with torrents, so please help me update my Client or something so i can play with this 18Mb version

EDIT 2: I never had problems with 18Mb installer version