I just got a used Macbook A1342 (2009) handed down to me from a sister. Let me start by saying that even though old, I love everything about it. The build quality is stellar - a magnitude better than my Dell Latitude. Running OS X Lion 10.6.8 looks gorgeous and runs smoothly. I'm really liking my Mac! 
I have only one problem: Hearthstone (a PC game) isn't compatible with this version of OS X. Since I primarily use laptops for web browsing and playing lightweight games, I would like to upgrade but OS X Yosemite has gotten especially poor reviews. Additionally, I like the design and UI of 10.6.8 very much and really don't want to change. How can I upgrade to an earlier version of OS X (free)?
I have only one problem: Hearthstone (a PC game) isn't compatible with this version of OS X. Since I primarily use laptops for web browsing and playing lightweight games, I would like to upgrade but OS X Yosemite has gotten especially poor reviews. Additionally, I like the design and UI of 10.6.8 very much and really don't want to change. How can I upgrade to an earlier version of OS X (free)?