I figured out why the models aren't being exported in the editor: in the CUDE.zip archive, according to the tutorial, there's a file called ConstUserData.xml, but the editor doesn't use it; instead, it uses UserData.xml. I simply deleted the former and renamed the one from the archive, and now it works; I can convert models myself.
That's quite strange, as this method has been personally tested on 3 different licensed versions with all the original patches: 1) Nival; 2) Buka; 3) Ubi
Moreover, on different licensed operating systems: 1) XP Pro x64 and 2) Seven Pro x64, everything worked normally!
In addition, esteemed comrade StetNoel uses a laptop with Vista Business x64, and he also has no problems; his game is the "Golden Edition" from Nival.
So, who knows what exactly is wrong in your specific case! :smile33:

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