Why can't I login or download DKO?
The server is not open yet. Please wait till 6pm PST
Do I need to download a new client for the Stress Test Beta?
Nope. This is a patch. So, if you played DKO CB and still have the previous client, you are fine.
Will my characters and level be carried over to the Stress Test?
Sorry, all characters from CB are wiped.
Will characters be wiped after the Stress Test?
Yes, all characters will be wiped before open beta--but you can get a costume in open beta for achieving level 20 during the Stress Test.