Hey there, I'm trying to update my older 13" macbook pro (MacbookPro5,5) from its current 10.5.8 to something a bit newer. Maybe Mountain Lion, or something like that. I doubt it could handle Mavericks or Yosemite. So here's my question! I have my Mac OS X Install DVD and Applications Install DVD from a slightly newer 15" Macbook Pro (MacbookPro6,2). But on the discs it specifically says "15-inch MacBook Pro -- Mac OS X Install DVD" Is it safe to use these on my 13" model? If it's not safe, and I need to purchase a new 10.6.0 upgrade for my older 13" mac, do I need the original install/applications DVD for a clean install? I no longer have access to these (Wife threw them out!) Thanks for reading!