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I was specifically turning centaurs into elves, not into some elf-centaurs.

I thought that inattentiveness on this forum was exclusively my privilege. :) (Although, I made a mistake here; I should have provided the full quote.)

Ivan010792, here is a link to the WoG reference guide, read it and learn:
Offline reference guide for the game Heroes of Might and Magic 3.58, In the Wake of Gods v.3.58f (Author: Sergey Drake).

Yes, I found all of that you described above, but it's NOT the same. I really did make changes to turn centaurs into elves; there weren't any Sylvan centaurs or an experience system. My friend (we don't talk anymore; it's been about 10-12 years) did the game settings. Moreover, there was a feature where, in any castle and for any race, you could, for example, upgrade centaurs into dragons (but it was too expensive and took too long to play). We played on his computer, and I was 13-14 years old, and I didn't have a computer at home. So, I decided to remember this game. The game is great as it is; you can play an XL map with bots for a week, but I want that function where you can transform lower creatures into higher ones.

Well, I don't know WoG that well, and I haven't played maps in WoG for 7 years, only in SoD/Complete Collection. So, it's best to ask for help on forums where WoG and other mod developers, modders, and players communicate, for example, http://wforum.heroes35.net/index.php?language=russian or http://forum.df2.ru/index.php?showforum=4.

Thanks, I'll look there. It's just the first forum I came across.

I told you, it's some kind of self-made script. I used to make a living doing that myself. In the ERM thread on that forum, ask if anyone can help.

...turn centaurs with upgrades into dragons, or spearmen into paladins...

You must have been really high when you made this mod :D