If you are one of the folks who's having problems with the patcher which stops at Worlds.rez.
Then here's a solution,
Go to https://url2i*****m/rqa
(I COULD NOT UPLOAD THE FILE ON MPGH SINCE ITS 72 MEGABYTES!)
There download the WORLDS.rez
Extract it anywhere on your pc.
And then copy it to: X:\Nexon\Combat Arms EU\game (X = You're harddrive's letter).
Now run the patcher again, and it will skip the WORLDS.rez since its already updated.