A bug you might like to fix, if you run the installer silently, via msiexec.exe /i splunkforwarder-8.0.3-a6754d8441bf-x64-release.msi AGREETOLICENSE=yes /passive, then the 8.0.3 version of Splunk UF installs on Windows 2012 R2.
I haven't tried running the installer interactively, but I know it doesn't abort the install on 8.0.3 on the unsupported OS. I was testing an upgrade script that had 7.3.5 and 8.0.3 in the package, initially I had a bug in the selection of the right UF to install, and found that it installed 8.0.3 on a Windows 2012 R2 server fine.
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