https://eu.4gamesupport.com/kb/lineage-2 but it shows up probably because of your antivirus, you need to make an exeption in quarantine for L2 folder
https://4gameforum.com/threads/626475/ 2 131 094 status - system was upgraded from previous version of OS and started then in debug mode. To disable debug mode run this .reg file - http://cdn.inn.ru/support/files/debug_uninstalled.rar Used this instruction?