I need to upgrade my OS 10.7.4 to 10.9 or higher for a program I need. How do I do that?
I have a MacBook Pro A1278. The current OS is 10.7.4. I am trying to use a photo editing program that requires 10.9 or higher. Can I upgrade my OS? If so, where and how? Thank you!
MacBook, Mac OS X (10.7.4)