It pretty much installs itself, but I have windows, so i wouldn't know if it's different. OptiFine Downloads
I also have windows, but yeah, just run the downloading things, it attaches itself to Minecraft and everything, and makes a profile.
I do have it on my mac but I can't remember what it is by default >_< I'm fairly certain once you download it it appears in the controls setting anyway though, just look for it.
Download it > Open it > Press Install Once it installed Click your drop down bar on your profiles, and fine the one called OptiFine > Click Play. Look in controls, if zoom isn't there, idk.
Why doesn't people just install optifine for free instead of buying the optifine cape? If there something different other then having a cape?
I wanted a cape, so I sent 20 dollars through another person and got someone else a cape too .-. You're welcome.