To install the patch, copy all files and folders into your Heroes directory.
WARNING! ZEOBJTS.TXT and some other files in data folder will be overwritten.

Then, if you NEVER installed any older patch versions, run H3WMapEdPatch.exe.

If your version of WoG isn't 3.58f, modify "Number of Monsters", "Number of 
Artifacts" and "Number of Dwellings" values in Data\MapEdPatch\Options.ini

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http://www.maps4heroes.com/heroes3/in_the_wake_of_gods.php