JustLineage Setup Guide
Enable support for non-unicode Korean programs.
Extract Client and Run Lineage.exe. Wait for any updates to complete.
From here double click STABLE_CONNECT.exe in the same folder as Lineage.exe to run the connector. Click The orange Launch button, and on the following pop up, press okay to patch, and cancel to launch. If this is the first time playing, it is advised to press okay. You will want to wait a little bit to let it download the patch, and once done, run lineage.exe to pack it (follow same stats as before, it will pack the downloaded files into the game files)
Once all patched up, just launch the connector, press cancel on the popup, and load up the game. Log in via the account created earlier, and create your characters.