Ok I'm going through the exact same problem Naibi has. A year ago, I could play this game just fine. Now, I can't. I boot the game up, I choose my scenario, I click new game, and I get an endless error pop-up saying stuff didn't load properly.
I changed my locale back from Japanese English, I thought that may have been the problem. It worked. I loaded up a game of Holly, could walk around and do some stuff, but the minute I tried to walk outside, the game crashed, and now I can't boot the game up at all. Again.
This was after I downloaded the stuff straight from the site. Nothing works.