RSAT is short for remote server administration tools, kind of handy when you like to work on/from you Windows client OS directly against a server OS, pretty much like adminak.msi “back in the days”. Just download the CORRECT version and don’t get suppressed when it doesn’t show up.  The RSAT is just a package, you need to enable the feature in the control panel first, as any feature you would like to enable, like telnet and such.

The Picture

this is how it looks when the RSAT package is installed, as you see it is now possible to add the features you need from within that package.

The GUI Way:

The DISM way:

dism /online /Enable-Feature /FeatureName:RemoteServerAdministrationTools /All

The POSH way:

Enable-WindowsOptionalFeature -Online -FeatureName RemoteServerAdministrationTools-Features -All

The links

Remote Server Administration Tools (RSAT) for Windows 8.1 
Remote Server Administration Tools (RSAT) for Windows 8 
Remote Server Administration Tools (RSAT) for Windows 7 with SP1 (both x86 and x64) 

The Read More

http://social.technet.microsoft.com/wiki/contents/articles/2202.remote-server-administration-tools-rsat-for-windows-vista-windows-7-windows-8-windows-8-1-windows-server-2008-windows-server-2008-r2-windows-server-2012-and-windows-server-2012-r2-dsforum2wiki.aspx#Download%20links

/mike