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Hello,
I just installed 10.2B on a Windows Server 2012 R2 Standard machine.
I received a message regarding compatibility of the Microsoft JVM component (not of OpenEdge).
For this install, I clicked on the "Run the program without getting help" option.
The installed product seemed to work fine. At this point, you should be able to install the 10.2B08 service pack.
The Microsoft JVM component is used by the Progress Explorer (MMC based) tool.
Instead of this tool, you can use OpenEdge Explorer which is available via a web interface at http://localhost:9090/
I also found a knowledge base article with a workaround:
knowledgebase.progress.com/.../P179938
I hope this helps.