HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

SoD 3.06 vs 2.98
Right-clicking on a creature during a trade caused a crash.
A scroll of Fly gave the hero a book (only if he was in battle). I can provide a save file if needed.

Clicking on a Castle for the second time caused a crash (crash log attached).