@pembertj, it shows Win 8.1 for me as well. It does work though if you try it.
EXCEPT - for 2012 R2 Datacenter. I seem to be having this exact same thing happening around this time. It has been racking my brain, but I'm on 2012 R2 Datacenter, and the patches they provide are not compatible with Datacenter. Has anyone else run into this?