You are correct. You have studied for your PMP exam using PMBOK Guide 5th edition material. So you can now take The PM PrepCast 6th Edition in order to earn 60 PDUs for your renewal. That is not a problem at all. Please see here for all the details:
6 years ago I've taken the course to prepare for the exam and to earn the required contact hours.
I've got PMP and renewed it 3 years ago.
For the next renew I need again 60 PDUs.
I wonder if I can take the course again and claim earned 60 PDUs. I believe that it should be OK for PMI but not sure.
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