I would suggest you to upgrade to latest PI AF Analysis version 2018 and AF Client 2018 SP1.PI AF 2018 supports Windows Server 2008 R2 SP1. I would also suggest you to upgrade in Dev/Test and check if your business logic is having any issues with AF analysis upgrade and move to production to ensure less impact.
Latest version release notes Reference : https://techsupport.osisoft.com/Viewer/File/b7d62798-8e0a-48b8-b49c-c0fb4238b3e0
Issue related to (PSE crash is fixed in latest version AF 2018 : "When an Event Frame Generation analysis that was created for 2014 (2.6.1) or older release of Analysis Service is opened with 2016R2 (2.8.5) version of PI System Explorer for configuration, the PSE will quit unexpectedly." .
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We would highly recommend for you to go to AF 2018.
While you're upgrading, you may want to reconsider your HA solution for AF. OSIsoft does not recommend AF Collectives as an AF HA solution: KB00634 - High Availability (HA) options for PI Asset Framework (PI AF)
Also, be careful upgrading your AF Collective, it's more involved than a simple AF upgrade. You can find the official procedure documented here: PI Server
Hope this helps,
Thanks Sebastien. I will review the links that you've provided and will use the recommended approach.