SQL 2008 R2 SP2, CU 1 : There are no SQL Server instances or shared features that can be updated on this computer

Hi,  I know this has been posted before, but I couldn't find a solution. Currently I have a SQL 2008 R2 SP2 Enterprise 2 node cluster.

I want to keep it updated, and downloaded CU 1 from here:

http://sqlserverbuilds.blogspot.com

Version from query:

Product Version       Service Pack       Edition
10.50.4033.0          SP2                    Enterprise Edition (64-bit)

When running the installation, I get the window attached.

Any clues?