My MacBook is about 4 years old now- Mac OS X 10.5.8. I want to install Google Drive but it requires Mac OS X 10.6 or higher. Do i pay for a 10.6 version or do i buy a higher version and how high can i go?
You pay for Mac OS X 10.6 unless you're a paid MobileMe member, in which case Apple will ship it to you for free. A Core Solo or Core Duo Mac can go to 10.6.8, while a Core 2 Duo or better can go to Mac OS X 10.7.4.