Recently we got a case where customer reported that he was unable to install the SUA SDk component on Windows 2008 R2.
Customers had added the feature “SubSystem for UNIX-based Applications” and then click on the link as displayed on the image below.
But this opens the Web page for the download utility for Windows 2008 and not Windows 2008 R2. Hence the customer downloaded the SUA SDK tool from incorrect location as below: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=23754
Suggested the customer to download the utility from the correct URL : http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=2391
After downloading the tool, we were able to install the SUA SDK on Windows 2008 R2.