Make sure you have correct patches, google zszc forum and first page that opens is their offical forum. There you have the latest download links which should work. As far as i know you have to have 1.688 patch installed before applying 1.690.As for game closing instantly after loging in, Its a common problem for me also, its just a crash. But reinstalling / changing resolution usually fixes the problem. The client isnt too stable i guess.
What error does the launcher give when it crashes ?