OK, I had a look at your saved game and it seems there aren't any problems with the area itself. Also, the fact that you can see Beregost moments before the game crashes means that something other than area corruption is stopping your progress. That doesn't help all that much, since there are still a wide range of possibilities of what is happening. But certainly, Beregost Crash Fixer can't help you.
To keep things simples, I would suggest finding ways to avoid the crashes from happening (and if you can find a pattern to the crashing that certainly helps), keep multiple saves (like you seem to already do), and avoid saving inside Beregost.
Sorry I can't help more than that.