Updating KRO/SAK is very easy. Here's a quick guide. There are 2 guides, one for Firefox, one for Internet Explorer. I recommend Firefox.
Obtain Mozilla Firefox from here:
www.mozilla.org
get a South Korean IP and Port from:
http://www.proxy4free.com/page1.html
(remember your looking for South Korea)
In your Firefox browser go to Tools -> Options -> Connection Settings -> Manual Proxy Configuration -> HTTP Proxy.
Type in the IP and Port Number in the HTTP section only, also check the "use this proxy server for all protocols" box, then click "Ok". Now you can download updates from KRO and SAK!
Now, go to your RO folder -->> C:\Program Files\Gravity\RO and run the file "Ragnarok" first, and let it update. Then run the file "sakray" and let it update. Both will take a while, so go get some food or watch a movie or sumin.
Now when your done with this, after the update is done, please be sure to go back and delete the IP address and set the proxy page back to "Direct connection to the internet", or next time you open up your broswer you will get many errors. Then your done!