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If that's the case, it's not good – not everyone needs new heroes. Adding new ones and changing the appearance of old ones are different things. Many would like to see changes in the appearance (the unfortunate female models of dwarves, mages, and Elves still haven't been implemented:( )
But UVH is just a visual update, and it's very easy to separate it from NHF! So, if you don't want to play with the new heroes in terms of their mechanics, you can separate their visuals! In principle, you can update UVH, but it will lose the new unique heroes!
С уважением, Psatkha (Псатха) 
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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1