Please assist, my friend downloaded H5 client from the RPG website, downloaded RPGUPDATER_EN_NEW.
After he downloaded client, run rpgupdate.exe and checked files. Once download finished he closed and then extracted both files from updater (rpgupdater and rpgupdater.ini ) and run rpgupdater once again, checked files.
Once download finish he click on START and then below error message shows up:
OS : No OS
CPU : GenuineIntel Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz @ 2296 MHz 4095MB RAM
Video : AMD Radeon R7 M260 (1267)
PosCode : LS1(273) 0 4/0 
Error setting display mode: No acceptable display modes found (D3D_OK). Please delete your Option.ini file if this error prevents you from starting the game.
History: UD3DRenderDevice::UnSetRes <- FindBestMatchingMode <- UD3DRenderDevice::SetRes <- UWindowsViewport::TryRenderDevice <- UWindowsViewport::OpenWindow <- UGameEngine::Init <- InitEngine
Exception code: 0xE06D7363 , Exception address: 0x75B25B68, Minidump: File saved to: '.\CrashDumps\l2.exe_Dump_20-06-49_21.11.2016.dmp'
First make a copy of you option.ini file just in case. Then open it with notepad. Edit the lines as follows:
Save the file and run the game, from l2.exe not updater.
Let me know how it went