Hero replacer.

Nothing like that... I specifically checked... if the video card has 2 GB, it reads and displays textures of 1024 pixels and larger perfectly in Heroes 5... I agree that this is not the case for most laptops... but again, on gaming, so to speak, top-end models, everything is fine, but again, the resolution is 1600 by 900 pixels, while on desktops it is 1920 by 1080 - which are supported modes for the game!

I didn't say anywhere that the game doesn't recognize or read textures with a resolution higher than 1024x1024; I was talking about how overloaded it becomes as a result. And because of this, the game often crashes. I have a gaming laptop from 2019, ASUS TUF Gaming FX505-DT Win10x64, 16 GB of RAM, 1650GTX 4GB video card, AMD Ryzen 3550H processor, 2.1 GHz. More than good hardware. Nevertheless, I installed mods from the respected master Zahar0z. And he has textures with sizes of 2048x2048, and they weigh more than 20 MB. This is a lot for the game. Yes, the game reads the textures, but sometimes there is a glitch that instead of textures on his units, it shows a checkerboard pattern. The same applies to other custom mods, where, in pursuit of a "high-quality picture," they create textures of enormous resolution and enormous size. This is not good. The well-known colleague Xuxo creates textures in acceptable resolutions and sizes, and everything works, nothing crashes, and everything looks normal. Heroes 5 is still not Heroes 6, where each texture can weigh up to 5 MB (or more), and everything works fine and doesn't crash. Heroes 5 is an old game with its own engine; you shouldn't force it; you need to work with it carefully.

Regarding the custom mods that I use and because of which I constantly had game crashes during the walkthrough: I set the appropriate resolutions and sizes for the textures used in the custom mods, and the crashes stopped happening.

Added 1 minute ago

I also recommend PhotoZoom Pro; it easily and conveniently handles many tasks. I wanted to comment that I have been working on reworking the heroes for some time, paying special attention to the heads, exploring applications for converting icons into more detailed textures using AI (debates between voila AI artist and Toonme), and trying to find programs to convert these textures into 3D meshes. I have been unsuccessfully trying to get a character creator and the Headshot plugin. I am not going to add eye and mouth animations; that would be too much work and little benefit.
I am attaching an example of two styles that I am going to mix and turn into clean textures.

All this is, of course, great, colleague. It's great that such an opportunity exists. But in my opinion (subjectively), the portraits now have a Japanese anime style. This is unacceptable to me, but I hope other users will like it.