In the midst of our excitement to roll out our last update, we sadly let a small bug slip into the build at the last moment that caused download/update problems for a number of FFC players. We're really sorry if you were affected!
We've rolled back to a previous build that should clear up the problem but we need to look into the issue a bit more over the next week to make sure there's no additional nasties hiding in that piece of code.
Hopefully the roll back should fix most people's issues, but please do drop a message on the discussion boards if you're continuing to have problems. Sorry again!