MMH5.5 - Heroes of Might and Magic 5.5

rikzombie, hey! To be honest, I've only played 5.5 solo so far. You were talking about the conditions for preventing desynchronization... are you referring to this?

Eight skills - Whenever you start a new LAN game using the 8th skills option, you must follow these steps; otherwise, desync is very likely to happen mid-game, and turns would not be passed. Also, some of the players (that do not have 8th skills on) may have some of their main heroes' skills changed/removed when loading a save game.

a) Before creating/joining a new or saved game, all participants must activate the 8th skills by going to Multiplayer -> Hot Seat -> Standard Game and marking the 8th skills option as shown here (Here is how it looks unmarked ).

b) Create/Join the game and play.

c) The 8th skills option should be ON before joining a saved game that has been started as such. If one or some of the players join without the option ON, the game will likely crash.

Note - The 8th skills option is automatically turned off every time the Heroes V application is closed. The save game does not include a note on how many skills the game started with, so check it every time when loading :).

And another important thing... you can't use the new AI in a LAN game; playing with AI in a LAN is only possible with the MMH55-Utility.exe file.

If you haven't seen anything like this before, I recommend translating it, reading it, and following the instructions written back in 2015.
If you have followed these conditions, and you are sure that your friend has followed them, then you need to describe the situation as detailed as possible: what happens, when, and how it happens, what are the launch parameters... everything that might help to understand what the error is.
Good luck!

PS: I found all this on Google... although I don't quite understand it. It says that EE won't work in a network game, but this isn't mentioned in EWA, and it seems to work. The only question is whether this problem also occurs in EWA.