KJams Wiki:General disclaimer
By buying kJams, you agree not to be bummed out by bugs, crashes, loss of data, or any other problem that may arise due to using pre-release software. You are paying for early access to possibly buggy software that is still in development.
I am not responsible for your problems. Lack of planning or proper precaution on your part does not constitute an emergency on my part. But I will probably help you anyway. :)