Our Custom client is required to play on servers.
Download the client from the links above and then install the patch.
Using an archiver, extract the client and patch files from the archive.
In the unpacked system-ru or system-eu folder, find the L2.exe file and run it. Wait for the client to launch and start playing!
If the game does not start, disable the antivirus and add the game folder to the antivirus exclusions. After that, repeat the unpacking of the patch.