Instead of risky cracks, the community overwhelmingly recommends the as the safest and most functional "portable" solution. Top Ways to Play HoMM 3 Without a CD

If you have issues running a legitimately purchased copy:

Run a portable, DRM-free version legally:

If the portable version won't launch, ensure you have "Legacy Components -> DirectPlay" enabled in your Windows Features.

: Run the HD Mod installer and point it to your game folder.

Q: Can I play the game with a controller? A: Yes, the game supports controller input.