NHF – new heroes for Heroes V 3.1.

Hello! I installed patch 0.88 on the licensed version of Heroes 3.1, and we tried to play a multiplayer game with a friend using "Hamachi": an error appears: "the checksum of the client's game database does not match the checksum of the server's game database. Check the installed modifications and patches. Error code 0.2.0." Removing the patch didn't help; the error remains. We tried both a standard map and a map called "Absolute Power," which was processed through a program. Is it possible to solve this problem?