What CCP version to use when studying for the 640-554?

I have 2.5 loaded on a voice gateway at home, but I have access to 2.8, and wondering if it is too new of a version to study with for the current version of the exam? Or could I ask what version you guys studied with?

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TechGuru80

.8 seems to be working fine for me. When using CBT Nuggets it matches the videos also.

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