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Thank you for the information.
NCF creatures should not appear by default; the mod only includes a few for internal use, and they cannot appear on the map. However, you can install some additional packs; they won't conflict.
Regarding the network game issue, it's strange. I tested the most basic LAN mechanics, and everything worked. I will recheck everything. Looking at the size of MCCS_Adds.pak, I see that NHF heroes are included. Try temporarily disabling it and see what happens. It's possible that this is causing some conflict. Also, a specific screenshot of the error would be helpful. Judging by "Can't find Path," it seems like some Lua file is not loading; it would be helpful to know which one.