I have this exact problem too Emily. I think its because they have updated Anki 2 to version 2.1.1 so it no longer accepts the file type that Koichi used to create all his decks. Thankfully I still have Anki 1 on my PC, so I can still use that, but some of the more difficult decks towards the end point of Textfugu require Anki 2, so eventually I will need to jump ship again and be right back at this problem -__-

Hopefully they will do something about this soon, but who knows how much they support this site anymore with all efforts seemingly going towards the never-ending push to release EtoEto