The "old" PM PrepCast "expires" on July 31st in the sense that you should no longer use it to prepare for your PMP exam. This is because that version is based on PMBOK 4 and after July 31st the exam will be based on PMBOK 5. So if you want to properly prepare for the exam after July 31st, then you should buy and use the new prepcast.
However, the 35 Contact Hours that you have earned by watching The "old" PM PrepCast are still valid. Contact hours never expire. So purely theoretically you could watch the "old" PrepCast and still take the "new" exam. But I cannot say how successful you will be, because the PMBOK Guide has changed quite a bit.
You are asking about two things that are quite different:
1.) PrepCast Final Exam: This will continue to be available to you. So you can take the Final Exam for the "old" PrepCast anytime in the future and earn your 35 Contact Hours.
2.) Using the "old" PrepCast for the "real" PMP Exam: DON'T!!! As of yesterday the PMP exam is based on the PMBOK Guide 5th Edition, but The "old" PM PrepCast is based on the 4th edition. This means that you can NOT use the "old" PrepCast to prepare for your PMP exam.
Until Next Time,
Cornelius Fichtner, PMP, CSM
President, OSP International LLC
Moderators: Yolanda Mabutas, Ahmed Amin, Scott Gillard, Mary Kathrine Padua, ERIC BARTLETT, Gail Freedman, Kevin Nason, Steven Mudrinich, PMP, Mark Wuenscher, PMP, John Wolverton, Tracy Shagnea, PMP, Jada Garrett
This interview with Simona Fallavollita (LinkedIn Profile) was recorded at the magnificient Project Management Institute (PMI)® Global Conference 2017 in Chicago, Illinois. We discuss the how, what, why and when of the changes that are coming to the PMP exam.