1) Download hLaPEx .
2) Extract it.
3) Copy the extracted files / folder (hLaPEx.exe , inside.dll / data).
4) Paste the file Here Or ( C:/Program Files/Lineage II/system/ ) Or Wherever you have Lineage II installed.
5) Execute the file hLaPEx.exe which is in the system folder in the Lineage II directory. Wait 10 seconds and press the RUN button on hLaPEx's window.
6) Execute the file L2.exe which is in the system folder in the Lineage II directory.Wait untill it loads and then fill in your account. Choose your character and press the Start Button.
Now you are logged in with hLaPEx injected. If you are running Lineage II in Fullscreen mode, then press Alt + Tab to switch to Windowed mode. Resize the window as you like.