This guide is for educational purposes only. Distributing copyrighted client files (the .PAK files from the official game) is illegal. Most private servers rely on reverse-engineered "L1J" (Lineage 1 Java) projects, which contain no original NCsoft code, but you must own a legitimate copy of the client.
If your Windows installation is not in English, you may need to change the system region and language settings for the client to function properly. lineage 1 private server setup