Sinot
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Serpens, thank you for the accurate answers!
Are you by any chance from Technical Support?
This is an instruction from the mod's main page.
You just need to click the "READ MORE" button, which is carefully hidden.
Added after 8 minutes
Regarding the Unofficial Community Patch (UCP) 1.2 version with Russian localization, this mod is a must-have.
Without it, I could only play Heroes 7 for half an hour, after which I wrote a review on Steam saying that it was the worst part of the Heroes series and deleted it forever.
But with this mod installed, Heroes 7 looks and plays very well.
It doesn't quite reach the level of Heroes 5, but it's very decent.