The RSAT link is http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=7d2f6ad7-656b-4313-a005-4e344e43997d
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Then go to Control Panel > Programs and Features > Turn Windows features on or off. Now select "Remote Server Admin Tools". You have to expand each component and check the ones you want. Once that runs you can add the in the MMC snap in. Good luck!
Turned on-
Remote Server Admin Tools
Server ManagerRole Admin Tools
DNS Server Tools
AD DS and AD LDS TOOLS
Remote Desktop Services ToolsFeature Admin Tools (These may not be needed, or only applicable to NT Systems and Security Team)
GPO ToolsSMTP Server Tools
Windows System Resource Monitor Tools