First you have to download the Lineage2 Gracia Final Client from the official page, file play,  torrent 1, torrent 2, or any other page.
After installation, go to the "system" folder which is in the game folder, search an executable named l2.exe, and create a shortcut on you desktop.

Make sure you don't update to epilogue

Download the system folder from here

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If you get diffrent protocol error it means you don't have the correct Gracia Final Client!

If you still can't connect, try deleting your host file from C:\WINDOWS\system32\drivers\etc

If you have any problem,don't hesitate to contact us via form.
Good luck && Have Fun!