Sinot
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The Russian version of the third part is available on GOG, and the HD mod shouldn't affect the language files, but when the mod is installed, the game starts in English.
It doesn't affect them.
I have the Russian version of GOG - Heroes of Might and Magic® 3: Complete for 154 rubles.
On top of that, I have Hota 1.5.4 installed.
On top of that, I have the HD mod 5.0 RC50 installed.
On top of that, I have the SuperPack_Rus 1.5 plugin installed.
And everything is in Russian.
There is no English anywhere.