its probably the new ip ban usa has to ip proxy a uk proxy server made it work for me i used hidemyass.com set it to maidenhead2 for uk 1 probably works tooo i wonder if all the players w american ips that registered before the block will be able to play because when u register they grab the ip luckily mine was proxied so i was ok
you also need to change your region settings in windows to russia or russian federation and i had to enable russian language to work w the files but other people didnt maybe something w unicode

... 13216Z.exe
Install it and create an account. It is a bit difficult because of cyrillic but i made it with a few tries and guessing.
After that install the russian l2 version
a) via this loader
or
b) here:

... 2.6_P3.rar
If you download it via the link you have to set the path to your l2 folder later in the loader.
After that you need to change your windows shemata for programs that dont use unicode to "Russian" so that your windows is able to start the russian L2 version.
For me using windows 7 it's like:
System Configuration -> Time, Language, Region -> Change place
Then i got the window you see in the screenshot.
Then i choose "Russian Federation".
Just search a bit you will find it.
For English Files:
Update your "normal" L2 Version (from N/A servers) to High5.
Take a look in the system folder. Rename all the files with a "...-e.dat" in it in "...-ru.dat".
(Simply exchange the e with ru)
Copy and paste them in your RUoff system folder.