Auto-translated
Okay, after a completely broken game, a day of trying to clean the computer of all Heroes files, re-downloading my version from Google Drive, and additional attempts to understand what was wrong (the catch was that the Estonian didn't show everything in the video; I found a point in Zakhar's 2.3 guide that says about 2 Zip files and where they need to be installed), I finally got it working!
BUT! Smooth shading has disappeared... and that's extremely important. Those who have uploaded their models, please share how it was for you? Maybe something needs to be done additionally in Maya? I've never worked with Maya before and only created the bone structure there following the Estonian's tutorial.
A small number of polygons can be masked with an additional normal map texture or by playing around with the game engine's materials. Or, you can increase the number of triangles.
