Downloaded Mavericks to install on a 2009 MBP I've been asked by the Mac User Group to clean up and offer for sale. I used the 2014 MBA (originally came with 10.9.2) and when the download finished, it announced that the download of 10.9.5 was too old for the particular hardware. No biggie, I was only downloading it. I don't yet have the old MBP to fix, that'll be another week.