Heroes 2 online. Applications. Issues.

1) The game is not a licensed copy. 2) The versions are identical (I copied it from a friend). 3) The game crashes approximately every 2-3 minutes, regardless of whether it's during a turn, in the castle, or during a battle. The game simply closes, and Windows doesn't display any error messages. Sometimes it crashes for me, and sometimes it works fine for me, but then it crashes for him. 4) Hamachi seems to be working normally, as we use it to play Age of Empires without any problems. The ping is around 88-90 ms, and the TTL is consistently 128.