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It is installed as a patch (at least, that's how it works for me). If you have Heroes 4: Alexander the Great, the map should work, and you will be able to participate. Good luck.
In general, we should probably wait for Luchik's response...:). I only have version 4 (the oldest ones). I am, of course, grateful for the "Good luck," but let's wait to see what the organizer says... she will probably make the final decision.
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."