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

When loading a password-protected save, 3-4 strange windows pop up. And it happens every time.

Oops, you're right. :)

The map doesn't open at all. There's not even a corresponding prompt.

I understand. Ideally, I should have modified the editor to ask for passwords, but that's quite problematic, so I didn't touch the editor and don't plan to.

To open a password-protected map in the editor, you need to remove the protection in the game:
New game -> random map -> show generated maps -> double-click on the map -> enter the passwords, check the "remove protection" box.
-> read the message about the successful operation.
Now the map can be opened in the editor.

Nevertheless, the report turned out to be useful: in a number of cases, the game is simultaneously patched with both 2.98 and 3.19. This must be absolutely excluded.

And how do I do that?Well, that's my problem, how to do it.