Reply to Midi Fighter Utility Issue

Hi guys wondering if someone can help with this, I recently updated to mavericks and decided to clean out my HD in the process.

I am downloading the MF utility and it allows me to open the .PKG file but won't allow me to open the second .PKG file within it, Claiming it is damaged and should be removed to trash with no other options other than cancel.

Anyone have an idea of how I can resolve this issue?

Thanks