Unfortunately you need to be running at least 10.10 Yosemite to perform a normal install of the Raw Camera Update 6.04 that includes support for the EM-5 Mark II.
For other compatibility reasons however I needed to stay on 10.9 Mavericks, though I wanted RAW support in Aperture and Preview for my new EM-5 Mark II.
Luckily, I have found that if you extract the two Raw Camera bundles from the 6.04 update package and copy them to System / Library / Core Services in place of the existing ones, after a restart you'll see that your .ORF files now render correctly and the RAW parameters can be edited in Aperture. I did this on the Unix command line using the command 'sudo cp' in order to preserve permissions; you MIGHT be able to do this by dragging in the Finder, but if that doesn't work you'll know why.