Arcater

I loved PoE I and II - and played it on my Mac. Will there be a Mac version of Avowed later on?

How can I start the White March expansion? I would like to continue from my last save game, but this is just before the end. And if I start the machine, the game ends with no clue about how to get into the expansion. And if I do not start the machine, the game does not find it's ending. Do I have to start a new game for this?