So I've got four computers I'm trying to connect to one another over LAN. Two are running Windows 10, two are running Windows 7. The two 7 computers connect just fine to each other, but the 10 computers can't connect to them. The two 10 computers connect to each other just fine, but the 7 computers can't connect to them.

I'm sorry if this has been answered elsewhere on the forums, but I've looked over the posts and haven't seen it. Any fix to it?

Any shame in bumping this? Coming back to this game for some nostalgic multiplayer, still having the same problem.

Check that all of the network connections are set to Private (rather than Public). On Windows 10, click on the network icon in the tray and choose Properties. On Windows 7, do the same and look for Network and Sharing Center. If that doesn't work or you can't find the settings, try looking for and turning on Network Discovery on all computers. I'm not sure that any of this is needed, but it's something to try.