Nah, you don't need these to play multiplayer. You should be able to use this mod to see the server list: https://jkhub.org/files/file/1408-the-jka-all-seeing-eye-server-browser-mod/ The issue is that the default master server that ships with the game is down (perhaps forever) and servers must use our alternative master server now. Mods like this, JA++, and the OpenJK project have the ability to point to secondary master servers. We will be making an article soon for people to follow some steps to get their server list functional again. Also, take a look at this thread.