Hi @Kumar V
I want to clarify in Windows server 2016 there is no Win server 2016 R2, it is the only version Windows server 2016.
And it is available for download and supported by Microsoft.
Below is the URL Windows server End Of Life (EOL)
Refer-
https://learn.microsoft.com/en-us/lifecycle/products/windows-server-2016
https://www.microsoft.com/en-us/evalcenter/evaluate-windows-server-2016
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