Hi Katie, you can go ahead and order the PM PrepCast. You'll have access until PMI releases a new version of the exam, and they only just did that this year, so we have no visibility about when any new version will be out. They'll give people plenty of notice. If you order the PM Exam Simulator (most people do) then you get 90 days access from the day you start using it, so I would buy it and then start using it once you have got your exam date locked in.