While many users search for "Windows Server 2016 Standard R2," Microsoft never officially released
Part 5: Step-by-Step Installation of Windows Server 2016 Standard 64-bit
Follow these instructions after booting from your USB/DVD.
Windows Server 2016 Standard is a server operating system developed by Microsoft as part of the Windows NT family of operating systems. It was released on October 12, 2016, and is the successor to Windows Server 2012 R2.
Unlike Windows Server 2008 (which had an R2) or Windows Server 2012 (which had an R2), Windows Server 2016 does not have an R2 release. The operating system is simply "Windows Server 2016." If you see a website claiming to offer a "Server 2016 R2" download, be cautious—it is likely a misleading title or a non-legitimate file. You want the standard Windows Server 2016 ISO.