With the release of the new version of Mac OS X, Snow Leopard, Apple has removed one of the components that is required for Cashcow to work. It is a fundamental component of the application and there's no way of making Cashcow Snow Leopard compatible.
If you are planning on upgrading to Snow Leopard, please export the data you have saved in Cashcow first so that you may continue to have access to the data you have built up.
I'm sorry for this situation. I am certainly disappointed with this change in Snow Leopard.
Bao