Forum regulars at UnityHQ are yearning for some online Multiplayer/Co-op NOLF2 action. To that end, they have created a WhatsApp group to coordinate ad-hoc online activity. Message Hugo at UnityHQ or post in the following thread to get information on how to join the NOLF2 WhatsApp group:

http://unityhq.net/forums/index.php?showtopic=4815

Also, UnityHQ staff and forum regulars will be happy to help you get the files and information you need to play online following the master server shutdown some years ago.