Epic War Age (EWA) - Adapted Mod Collection

AlexAnt, please provide more details. Which folder did you install the game in? Which folder did you install the mod in? Which folder did you move the NHF_0.87_data.pak and NHF_0.87_texts_RUS.pak files to?
Which folder did you install the NHF MS 0.10.exe patcher in?
Did this icon appear after you did all of that?

I installed it in the "C:\Games\Heroes5\game\Heroes of Might and Magic. Complete Gold Edition" folder.
In the same folder, so without NHF, everything works.
NHF in the data folder.
It runs without errors even with NHF, in case there are no maps mapped by the NHF 0.10 mapper in the maps folder.
At the same time, if there are campaigns mapped by NHF 0.10 in the UserCampaigns folder, everything is fine.
Have you tried running NHF 0.10 yourself? Now you can choose the folder in which to map the maps. It is not necessary to install (unpack) it in a specific location. Although I tried unpacking it into the game folder, there is no difference.
Yes, there is a warning with a question mark at the top of the launcher about NHF.