The shown screenshot indicates that you are trying to install the RSAT for Windows 7 (hence the 6.1).
The proper installer for Windows 8 is here: https://www.microsoft.com/en-us/download/details.aspx?id=28972
And the proper installer for Windows 8.1 is here: https://www.microsoft.com/en-us/download/details.aspx?id=39296
The RSAT packages are specific to the version of Windows you are running. Also, I should add that only Professional or higher version of Windows can run the RSAT.
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