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xGedx, the Russian localization was created for the licensed Russian version of Heroes of Might and Magic V: "Tribes of the East" v.3.1 and was not tested on the English version. I don't see the point in installing a Russian editor on the English version of the game. ;)))))))
Kэp, actually, all the instructions are written when you unpack it. But I'll repeat. Unpack the archive into the bin folder in the game's folder. There, a file called H5_MapEditor_rus_1.0.exe will appear. Run it, and voila, you have a Russian map editor! ;)))))) On my computer, the path to it is: D:/Games/Strategy/Heroes of Might and Magic V - Tribes of The East/bin/H5_MapEditor_rus_1.0.exe