A little more update - I've reached turn 160 in a campaign, after my first one was invalidated by an update, rendering my save game incompatible and corrupted unfortunately.

Had to start from scratch and the issue with Realm Divide is forcing you to fight battles essentially every turn, trying to protect your territories. Also a bit too easy to avoid enemy armies overall, particularly down rivers.

Can anyone confirm to me please the victory conditions? Do I have to conquer 95 provinces? (that's quite a lot...)