Heroes 6 - Discussion

Okay, I'll try to find patch 1.4 today.
But I'm a bit worried, what if all the campaign progress is lost, and I have to start playing again from the beginning...

with subsequent patches, bugs that were fixed in the previous one reappear

I really don't like that.
Maybe it makes sense to wait for patch 1.5 and install it right away?
And in general, are these patches critical if you just want to play the campaign? They don't seem to add anything new, but just fix bugs and balance the game, right?