Walkthrough tips, Discussion of Campaigns [Heroes 5]

There are so many mods like :rolleyes: ... which specific one is needed to change the original version from 1.6 to 3.0? Never mind, it seems it's not meant to be.

There is no such mod; it's an expansion pack, and you need to buy it, not download it. And there is a mod for this expansion pack that allows you to play the original game's campaigns in this expansion pack.