When you launch HOMM5 on a modern monitor (1920x1080, 2560x1440, or 4K), you are usually greeted by stretched UI, tiny menus, or massive black vertical bars on the sides of your screen. The game was hardcoded for 4:3 and 5:4 aspect ratios.

Widescreen fix :: Heroes of Might & Magic V General Discussions

To use this patch: