Exchange 2010 - Update Rollup 3 for SP2 fails to install with error 1603

When you try to install Rollup Update 3 for Exchange 2010 SP2 the update fails and the event log error 1024 is logged.

Update Error

When you try to install the Rollup Update that is found here the above message is displayed. This is because the MSP file was not installed as an Administrator.

Install from CMD

Run CMD as an Administrator and now run the installer. If you want a brew, then run it with /quiet and there will be no interaction.

Update Working

Now the installer will run correctly and install the Rollup Update.