Resolution change does not seem to work

I have downloaded VCMI - version 0.98c to check it out, and found out that game resolution change does not work at all for me:
Here is what I did:
I downloaded VCMI, unpacked it, added Data, Maps and mp3 folders from my game.

Whatever resolution I pick in launcher, it does not work and always starts with default 1024 x 768, and no matter what I click launcher preserves that setting on next runs. Changing resolution in settings.json file did not do anything as well (this file is not present in my older 0.98 version).
Do I do anything wrong or is it a bug?

Did you try the advice from this thread?

Not valid anymore, I believe it was issue with VCMI 0.98c, where apparently resolution change didn’t work at all