I admit, I only started playing it recently, so I haven't had time to really dive into all the flaws.
For me personally, HotA's formatting would have been enough (the font plus corrected paragraphs, which in the original Platinum overlap each other in some places). Unfortunately, I'm not strong in the technical part myself, so I have to make do with others' work.
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html