Is there a version of SCCM 2012 Upgrade Assessment Tool that is compatible with SCCM R2 ?
Where can I download it ?
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according to technet, the current available download is compatible with R2, have a look.
this is copied from technet
Updated: October 1, 2012
Applies To: System Center 2012 Configuration Manager SP1, System Center 2012 R2 Configuration Manager
Very good. It looks like all of the documentation has not been updated