i think we dont need to redownload all the game. i do it by my way and i install this game in 1 min.
1st - backup your Lineage II folder or move it to another location + create a empty Lineage II folder in old location.
2nd - remove NcLauncher + Lineage II in your Apps and Features (Win 10) or Programs and Features (Win 7)
3rd - install NcLauncher 2
4rd - sign in , select Lineage 2 to install.
Important: when you install Lineage 2, select your Lineage II folder which you backup.
All will be done in 1 minute. Enjoy newness! Cheer!