There are no 64-bit drivers. 
Here is the official reply I got from Jens:
Dear ,
Thank you for your request. 64-bis drivers are not available for the Catweasel - this is the reason why the product has been discontinued.
Your INDIVIDUAL COMPUTERS Support Team
Jens Schönfeld
Sooooooo yeah. end of a really cool thing.
This is somewhat a worrying trend. I've had my Inidivision AGA MK2 for a number of years now. Core updates have been very thin on the ground - and my faith that a Graffiti update might happen. Most likely by the time that happens Vampire 1200 will remove the need for that. If there could ever be an example of why closed source is a bad thing for the consumer - this is it.
