Originally Posted by Xaviez

Dunno if this has been posted as I cba reading through 32 pages of comments checking, but here’s how I fixed the “Game launching in Korean” issue:

Some info first:
My launcher said I had North American version after updating to latest patch.
I tried the quickfix, all my languages and region settings where correct so that didn’t help me.
I’m running it on Windows XP, not sure if that affects anything.

What I did:
I rightclicked Aion in Launcher and chose Uninstall game (important to do this from launcher and not elsewhere!).
It gave me a message saying the game could not be completely removed via the launcher, that I had to use “Add/remove programs” then asked me if I’d like to remove it from the list, I clicked Yes.
Rightclicked Aion again in the “Not installed” list, and chose “Install game”.
On the popup I chose “Customize”, made sure regional/language settings where ok and made sure it pointed to where Aion was on my harddrive.
When I proceeded it warned me that the folder was not empty and files would be overwritten, I hit OK.
Now, it told me it needed to download 6000+ MB, I just hit ok and let the installer start the download.
It proceeded to download only a 338,5 MB file, once the download was complete there no longer said North America on in my launcher and the game launched in English.

I truly hope this helps someone as I would hate to need to reinstall the entire game!
Also I dunno if Ayase or anyone else from NCSoft are reading all these replies, but if anyone are able to point him to this solution so it can be added to the OP it would be nice.

Fordítás:

Akinek tehát nem kerek a dolog:

A launcherben nyomjatok jobb klikket az Aionra, majd válasszátok az uninstall menüpontot. Fontos, hogy innen válasszátok ki és NE máshonnan. Ezután ki fogja írni majd,hogy a “Programok eltávolítása/hozzáadása” menüpontot kell használni. Miután ez meg volt megkérdezi majd,hogy szeretnéd-e eltávolítani a listából, nyomj IGEN-t.

Most a “Not Installed” listába megint jobb klikk az Aionra, és válaszd az Installt. A felugró ablakban válaszd ki a Costumize parancsot, itt fontos, hogy eu/angol legyen beállítva, és oda mutasson ahol az Aion installálva van. Most meg fogja kérdezni,hogy szeretnéd -e felülírni a fileokat, klikk az okéra.

Most majd egy 6000+ Mb-s filet akar letölteni, csak nyomj okét és  elkezd letölteni egy 338,5Mb-s filet és elméletileg innentől már működni fog.